the silent sound mode allows, among other things, to mute the Samsung device temporarily. if "temporary mute" is activated, the device is muted for one hour by default. the duration of the mute can be set to the minute up to 24 hours.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sounds and vibration
Step 3:  Tap on  Mute
Step 4:  Enable  Temporary mute
Step 5:  Tap on  Mute for
Step 6:  Choose between  1 hour ,  2 hours ,  3 hours  and  Custom
  1. Open the Settings
  2. Tap on Sounds and vibration
  3. Tap on Mute
  4. Enable Temporary mute
  5. Tap on Mute for
  6. Choose between 1 hour, 2 hours, 3 hours and Custom

Samsung Instructions