diff --git a/app/controllers/api/v1/accounts_controller.rb b/app/controllers/api/v1/accounts_controller.rb
index 4a97f0251e75a47cfafd446a53b740ba05a6c8d9..3e66ff212eba9b9127f38ab25453a4b2ae900b77 100644
--- a/app/controllers/api/v1/accounts_controller.rb
+++ b/app/controllers/api/v1/accounts_controller.rb
@@ -42,7 +42,7 @@ class Api::V1::AccountsController < Api::BaseController
   end
 
   def mute
-    MuteService.new.call(current_user.account, @account, notifications: truthy_param?(:notifications))
+    MuteService.new.call(current_user.account, @account, notifications: truthy_param?(:notifications), duration: (params[:duration] || 0))
     render json: @account, serializer: REST::RelationshipSerializer, relationships: relationships
   end
 
diff --git a/app/controllers/api/v1/mutes_controller.rb b/app/controllers/api/v1/mutes_controller.rb
index 805d0dee2abcb5211ca09c940d78aaa63291635a..fd52511d7eb0497d018551d61233a7a5b1d33666 100644
--- a/app/controllers/api/v1/mutes_controller.rb
+++ b/app/controllers/api/v1/mutes_controller.rb
@@ -7,7 +7,7 @@ class Api::V1::MutesController < Api::BaseController
 
   def index
     @accounts = load_accounts
-    render json: @accounts, each_serializer: REST::AccountSerializer
+    render json: @accounts, each_serializer: REST::MutedAccountSerializer
   end
 
   private
diff --git a/app/javascript/mastodon/actions/accounts.js b/app/javascript/mastodon/actions/accounts.js
index 723c04e554d96a3772c9080a0683dadadf3c0cf3..58b636602609718a41453f3ec0a310ba20b280c4 100644
--- a/app/javascript/mastodon/actions/accounts.js
+++ b/app/javascript/mastodon/actions/accounts.js
@@ -257,11 +257,11 @@ export function unblockAccountFail(error) {
 };
 
 
-export function muteAccount(id, notifications) {
+export function muteAccount(id, notifications, duration=0) {
   return (dispatch, getState) => {
     dispatch(muteAccountRequest(id));
 
-    api(getState).post(`/api/v1/accounts/${id}/mute`, { notifications }).then(response => {
+    api(getState).post(`/api/v1/accounts/${id}/mute`, { notifications, duration }).then(response => {
       // Pass in entire statuses map so we can use it to filter stuff in different parts of the reducers
       dispatch(muteAccountSuccess(response.data, getState().get('statuses')));
     }).catch(error => {
diff --git a/app/javascript/mastodon/actions/mutes.js b/app/javascript/mastodon/actions/mutes.js
index 9f645faee17bbf50579e26c7b001f057e0e68543..d8874f353f42c43cd9a88aa9aecd3089977eb4d8 100644
--- a/app/javascript/mastodon/actions/mutes.js
+++ b/app/javascript/mastodon/actions/mutes.js
@@ -13,6 +13,7 @@ export const MUTES_EXPAND_FAIL    = 'MUTES_EXPAND_FAIL';
 
 export const MUTES_INIT_MODAL = 'MUTES_INIT_MODAL';
 export const MUTES_TOGGLE_HIDE_NOTIFICATIONS = 'MUTES_TOGGLE_HIDE_NOTIFICATIONS';
+export const MUTES_CHANGE_DURATION = 'MUTES_CHANGE_DURATION';
 
 export function fetchMutes() {
   return (dispatch, getState) => {
@@ -104,3 +105,12 @@ export function toggleHideNotifications() {
     dispatch({ type: MUTES_TOGGLE_HIDE_NOTIFICATIONS });
   };
 }
+
+export function changeMuteDuration(duration) {
+  return dispatch => {
+    dispatch({
+      type: MUTES_CHANGE_DURATION,
+      duration,
+    });
+  };
+}
diff --git a/app/javascript/mastodon/components/account.js b/app/javascript/mastodon/components/account.js
index 2705a6001341bff0ad06bbfd060fe0c42f5248ca..0e40ee1d6a5543d6e28f1fdeae28fb0e898a1978 100644
--- a/app/javascript/mastodon/components/account.js
+++ b/app/javascript/mastodon/components/account.js
@@ -8,6 +8,7 @@ import IconButton from './icon_button';
 import { defineMessages, injectIntl } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { me } from '../initial_state';
+import RelativeTimestamp from './relative_timestamp';
 
 const messages = defineMessages({
   follow: { id: 'account.follow', defaultMessage: 'Follow' },
@@ -107,11 +108,17 @@ class Account extends ImmutablePureComponent {
       }
     }
 
+    let mute_expires_at;
+    if (account.get('mute_expires_at')) {
+      mute_expires_at =  <div><RelativeTimestamp timestamp={account.get('mute_expires_at')} futureDate /></div>;
+    }
+
     return (
       <div className='account'>
         <div className='account__wrapper'>
           <Permalink key={account.get('id')} className='account__display-name' title={account.get('acct')} href={account.get('url')} to={`/accounts/${account.get('id')}`}>
             <div className='account__avatar-wrapper'><Avatar account={account} size={36} /></div>
+            {mute_expires_at}
             <DisplayName account={account} />
           </Permalink>
 
diff --git a/app/javascript/mastodon/features/ui/components/mute_modal.js b/app/javascript/mastodon/features/ui/components/mute_modal.js
index 852830c3c2c93fd7c87de88e029db557bda9b3e1..51228b532e2bf3349b831e2f0f6c75fdacd6a828 100644
--- a/app/javascript/mastodon/features/ui/components/mute_modal.js
+++ b/app/javascript/mastodon/features/ui/components/mute_modal.js
@@ -1,25 +1,31 @@
 import React from 'react';
 import { connect } from 'react-redux';
 import PropTypes from 'prop-types';
-import { injectIntl, FormattedMessage } from 'react-intl';
+import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import Toggle from 'react-toggle';
 import Button from '../../../components/button';
 import { closeModal } from '../../../actions/modal';
 import { muteAccount } from '../../../actions/accounts';
-import { toggleHideNotifications } from '../../../actions/mutes';
+import { toggleHideNotifications, changeMuteDuration } from '../../../actions/mutes';
 
+const messages = defineMessages({
+  minutes: { id: 'intervals.full.minutes', defaultMessage: '{number, plural, one {# minute} other {# minutes}}' },
+  hours: { id: 'intervals.full.hours', defaultMessage: '{number, plural, one {# hour} other {# hours}}' },
+  days: { id: 'intervals.full.days', defaultMessage: '{number, plural, one {# day} other {# days}}' },
+});
 
 const mapStateToProps = state => {
   return {
     account: state.getIn(['mutes', 'new', 'account']),
     notifications: state.getIn(['mutes', 'new', 'notifications']),
+    muteDuration: state.getIn(['mutes', 'new', 'duration']),
   };
 };
 
 const mapDispatchToProps = dispatch => {
   return {
-    onConfirm(account, notifications) {
-      dispatch(muteAccount(account.get('id'), notifications));
+    onConfirm(account, notifications, muteDuration) {
+      dispatch(muteAccount(account.get('id'), notifications, muteDuration));
     },
 
     onClose() {
@@ -29,6 +35,10 @@ const mapDispatchToProps = dispatch => {
     onToggleNotifications() {
       dispatch(toggleHideNotifications());
     },
+
+    onChangeMuteDuration(e) {
+      dispatch(changeMuteDuration(e.target.value));
+    },
   };
 };
 
@@ -43,6 +53,8 @@ class MuteModal extends React.PureComponent {
     onConfirm: PropTypes.func.isRequired,
     onToggleNotifications: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
+    muteDuration: PropTypes.number.isRequired,
+    onChangeMuteDuration: PropTypes.func.isRequired,
   };
 
   componentDidMount() {
@@ -51,7 +63,7 @@ class MuteModal extends React.PureComponent {
 
   handleClick = () => {
     this.props.onClose();
-    this.props.onConfirm(this.props.account, this.props.notifications);
+    this.props.onConfirm(this.props.account, this.props.notifications, this.props.muteDuration);
   }
 
   handleCancel = () => {
@@ -66,8 +78,12 @@ class MuteModal extends React.PureComponent {
     this.props.onToggleNotifications();
   }
 
+  changeMuteDuration = (e) => {
+    this.props.onChangeMuteDuration(e);
+  }
+
   render () {
-    const { account, notifications } = this.props;
+    const { account, notifications, muteDuration, intl } = this.props;
 
     return (
       <div className='modal-root__modal mute-modal'>
@@ -91,6 +107,21 @@ class MuteModal extends React.PureComponent {
               <FormattedMessage id='mute_modal.hide_notifications' defaultMessage='Hide notifications from this user?' />
             </label>
           </div>
+          <div>
+            <span><FormattedMessage id='mute_modal.duration' defaultMessage='Duration' />: </span>
+
+            {/* eslint-disable-next-line jsx-a11y/no-onchange */}
+            <select value={muteDuration} onChange={this.changeMuteDuration}>
+              <option value={0}>{intl.formatMessage({ id: 'mute_modal.indefinite' })}</option>
+              <option value={300}>{intl.formatMessage(messages.minutes, { number: 5 })}</option>
+              <option value={1800}>{intl.formatMessage(messages.minutes, { number: 30 })}</option>
+              <option value={3600}>{intl.formatMessage(messages.hours, { number: 1 })}</option>
+              <option value={21600}>{intl.formatMessage(messages.hours, { number: 6 })}</option>
+              <option value={86400}>{intl.formatMessage(messages.days, { number: 1 })}</option>
+              <option value={259200}>{intl.formatMessage(messages.days, { number: 3 })}</option>
+              <option value={604800}>{intl.formatMessage(messages.days, { number: 7 })}</option>
+            </select>
+          </div>
         </div>
 
         <div className='mute-modal__action-bar'>
diff --git a/app/javascript/mastodon/locales/en.json b/app/javascript/mastodon/locales/en.json
index 9c8b3d11ba6ac456f0e16a86733092f043ba7774..b53731340872111d06e5d5311c4e09507406b6a1 100644
--- a/app/javascript/mastodon/locales/en.json
+++ b/app/javascript/mastodon/locales/en.json
@@ -276,6 +276,8 @@
   "missing_indicator.label": "Not found",
   "missing_indicator.sublabel": "This resource could not be found",
   "mute_modal.hide_notifications": "Hide notifications from this user?",
+  "mute_modal.duration": "Duration",
+  "mute_modal.indefinite": "Indefinite",
   "navigation_bar.apps": "Mobile apps",
   "navigation_bar.blocks": "Blocked users",
   "navigation_bar.bookmarks": "Bookmarks",
diff --git a/app/javascript/mastodon/locales/ja.json b/app/javascript/mastodon/locales/ja.json
index ec3d0ee59a559336ffe162a326a24354afa04994..2a1df987c18e910062418cf8b8cee3f2bec36b15 100644
--- a/app/javascript/mastodon/locales/ja.json
+++ b/app/javascript/mastodon/locales/ja.json
@@ -268,6 +268,8 @@
   "missing_indicator.label": "見つかりません",
   "missing_indicator.sublabel": "見つかりませんでした",
   "mute_modal.hide_notifications": "このユーザーからの通知を隠しますか？",
+  "mute_modal.duration": "ミュートする期間",
+  "mute_modal.indefinite": "無期限",
   "navigation_bar.apps": "アプリ",
   "navigation_bar.blocks": "ブロックしたユーザー",
   "navigation_bar.bookmarks": "ブックマーク",
diff --git a/app/javascript/mastodon/reducers/mutes.js b/app/javascript/mastodon/reducers/mutes.js
index 4672e50974eaa2a1394b5df9a6c51bc15548e0fa..a9eb61ff834cbcff296c6ad0d1ec1d541a0ba3cf 100644
--- a/app/javascript/mastodon/reducers/mutes.js
+++ b/app/javascript/mastodon/reducers/mutes.js
@@ -3,12 +3,14 @@ import Immutable from 'immutable';
 import {
   MUTES_INIT_MODAL,
   MUTES_TOGGLE_HIDE_NOTIFICATIONS,
+  MUTES_CHANGE_DURATION,
 } from '../actions/mutes';
 
 const initialState = Immutable.Map({
   new: Immutable.Map({
     account: null,
     notifications: true,
+    duration: 0,
   }),
 });
 
@@ -21,6 +23,8 @@ export default function mutes(state = initialState, action) {
     });
   case MUTES_TOGGLE_HIDE_NOTIFICATIONS:
     return state.updateIn(['new', 'notifications'], (old) => !old);
+  case MUTES_CHANGE_DURATION:
+    return state.setIn(['new', 'duration'], Number(action.duration));
   default:
     return state;
   }
diff --git a/app/javascript/styles/mastodon-light/diff.scss b/app/javascript/styles/mastodon-light/diff.scss
index 6b81e762370b43bb9e4c751fac10f1a4682fea7d..64f4adb848c3b2fcf148b0dc8cd8733b022ee27f 100644
--- a/app/javascript/styles/mastodon-light/diff.scss
+++ b/app/javascript/styles/mastodon-light/diff.scss
@@ -759,3 +759,8 @@ html {
 .compose-form .compose-form__warning {
   box-shadow: none;
 }
+
+.mute-modal select {
+  border: 1px solid lighten($ui-base-color, 8%);
+  background: $simple-background-color url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14.933 18.467' height='19.698' width='15.929'><path d='M3.467 14.967l-3.393-3.5H14.86l-3.392 3.5c-1.866 1.925-3.666 3.5-4 3.5-.335 0-2.135-1.575-4-3.5zm.266-11.234L7.467 0 11.2 3.733l3.733 3.734H0l3.733-3.734z' fill='#{hex-color(lighten($ui-base-color, 8%))}'/></svg>") no-repeat right 8px center / auto 16px;
+}
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 8a8f20baa540c35ce0b3eb2bfdc1200a9726b9db..378d1640fdb183497924574e862b8f8acb5207bd 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -5074,6 +5074,22 @@ a.status-card.compact:hover {
       }
     }
   }
+
+  select {
+    appearance: none;
+    box-sizing: border-box;
+    font-size: 14px;
+    color: $inverted-text-color;
+    display: inline-block;
+    width: auto;
+    outline: 0;
+    font-family: inherit;
+    background: $simple-background-color url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14.933 18.467' height='19.698' width='15.929'><path d='M3.467 14.967l-3.393-3.5H14.86l-3.392 3.5c-1.866 1.925-3.666 3.5-4 3.5-.335 0-2.135-1.575-4-3.5zm.266-11.234L7.467 0 11.2 3.733l3.733 3.734H0l3.733-3.734z' fill='#{hex-color(darken($simple-background-color, 14%))}'/></svg>") no-repeat right 8px center / auto 16px;
+    border: 1px solid darken($simple-background-color, 14%);
+    border-radius: 4px;
+    padding: 6px 10px;
+    padding-right: 30px;
+  }
 }
 
 .confirmation-modal__container,
diff --git a/app/models/concerns/account_interactions.rb b/app/models/concerns/account_interactions.rb
index 427ebdae29c36bb8a84baed701db6897a9383c37..6a0ad5aa9825521ffa37162d11b0d2ea97de17f7 100644
--- a/app/models/concerns/account_interactions.rb
+++ b/app/models/concerns/account_interactions.rb
@@ -131,9 +131,12 @@ module AccountInteractions
                        .find_or_create_by!(target_account: other_account)
   end
 
-  def mute!(other_account, notifications: nil)
+  def mute!(other_account, notifications: nil, duration: 0)
     notifications = true if notifications.nil?
-    mute = mute_relationships.create_with(hide_notifications: notifications).find_or_create_by!(target_account: other_account)
+    mute = mute_relationships.create_with(hide_notifications: notifications).find_or_initialize_by(target_account: other_account)
+    mute.expires_in = duration.zero? ? nil : duration
+    mute.save!
+
     remove_potential_friendship(other_account)
 
     # When toggling a mute between hiding and allowing notifications, the mute will already exist, so the find_or_create_by! call will return the existing Mute without updating the hide_notifications attribute. Therefore, we check that hide_notifications? is what we want and set it if it isn't.
diff --git a/app/models/mute.rb b/app/models/mute.rb
index 0e00c2278f6f6be1a83e620d41730e0f7c6488aa..578345ef644ad4459a90fde1be38c540d7e5cb82 100644
--- a/app/models/mute.rb
+++ b/app/models/mute.rb
@@ -9,11 +9,13 @@
 #  account_id         :bigint(8)        not null
 #  target_account_id  :bigint(8)        not null
 #  hide_notifications :boolean          default(TRUE), not null
+#  expires_at         :datetime
 #
 
 class Mute < ApplicationRecord
   include Paginable
   include RelationshipCacheable
+  include Expireable
 
   belongs_to :account
   belongs_to :target_account, class_name: 'Account'
diff --git a/app/serializers/rest/muted_account_serializer.rb b/app/serializers/rest/muted_account_serializer.rb
new file mode 100644
index 0000000000000000000000000000000000000000..3ddd706dcd327b0f28c81f878e052745c442ecb8
--- /dev/null
+++ b/app/serializers/rest/muted_account_serializer.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class REST::MutedAccountSerializer < REST::AccountSerializer
+  attribute :mute_expires_at
+
+  def mute_expires_at
+    mute = current_user.account.mute_relationships.find_by(target_account_id: object.id)
+    mute && !mute.expired? ? mute.expires_at : nil
+  end
+end
diff --git a/app/services/mute_service.rb b/app/services/mute_service.rb
index 676804cb991d97fa718f9b5554c47ea339daf4da..9ae9afd623498d3a6b0baaa7d6cb7d91a88fea6f 100644
--- a/app/services/mute_service.rb
+++ b/app/services/mute_service.rb
@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
 class MuteService < BaseService
-  def call(account, target_account, notifications: nil)
+  def call(account, target_account, notifications: nil, duration: 0)
     return if account.id == target_account.id
 
-    mute = account.mute!(target_account, notifications: notifications)
+    mute = account.mute!(target_account, notifications: notifications, duration: duration)
 
     if mute.hide_notifications?
       BlockWorker.perform_async(account.id, target_account.id)
@@ -12,6 +12,8 @@ class MuteService < BaseService
       MuteWorker.perform_async(account.id, target_account.id)
     end
 
+    DeleteMuteWorker.perform_at(duration.seconds, mute.id) if duration != 0
+
     mute
   end
 end
diff --git a/app/workers/delete_mute_worker.rb b/app/workers/delete_mute_worker.rb
new file mode 100644
index 0000000000000000000000000000000000000000..eb031020e1b2cfea2cad1b1dcd0d966161a25b4c
--- /dev/null
+++ b/app/workers/delete_mute_worker.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class DeleteMuteWorker
+  include Sidekiq::Worker
+
+  def perform(mute_id)
+    mute = Mute.find_by(id: mute_id)
+    UnmuteService.new.call(mute.account, mute.target_account) if mute&.expired?
+  end
+end
diff --git a/db/migrate/20200317021758_add_expires_at_to_mutes.rb b/db/migrate/20200317021758_add_expires_at_to_mutes.rb
new file mode 100644
index 0000000000000000000000000000000000000000..eaae8319d7c11080081c20c5bc5bdd399186b6b0
--- /dev/null
+++ b/db/migrate/20200317021758_add_expires_at_to_mutes.rb
@@ -0,0 +1,5 @@
+class AddExpiresAtToMutes < ActiveRecord::Migration[5.2]
+  def change
+    add_column :mutes, :expires_at, :datetime
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 5805f31050ff228b15148b5f79b0def8abac1acc..262e25b3bab1a5593a30127876c87ca14994d45c 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -545,6 +545,7 @@ ActiveRecord::Schema.define(version: 2020_10_08_220312) do
     t.boolean "hide_notifications", default: true, null: false
     t.bigint "account_id", null: false
     t.bigint "target_account_id", null: false
+    t.datetime "expires_at"
     t.index ["account_id", "target_account_id"], name: "index_mutes_on_account_id_and_target_account_id", unique: true
     t.index ["target_account_id"], name: "index_mutes_on_target_account_id"
   end