Facebook recognizes that it's important to take a break from social media not only for spending time with family or productivity, but also for mental health. Because of this, it's added a new "Quiet Mode" timer to help curb your time on the Facebook app. Enabling Quiet Mode will mute notifications for the time you specify. If you try to open the app during Quiet Mode, you'll be reminded that you're still in Quiet Mode with a shortcut to manage its settings. We couldn't find the new option anywhere on Android, but it may perhaps be available on the iOS version of the app...
Source: https://www.gsmarena.com/facebook_adds_quiet_mode_for_users_to_take_a_break_from_notifications-news-42571.php
