Quiet hours let you pause InterChat's notifications for a period you choose, so they don't interrupt you — overnight, for example, or during a set time of day.
Quiet hours are a setting kept on your device. When they're on, routine notifications are held back until quiet hours end.
If you've set up quiet hours but still want notifications working as expected the rest of the time, check I'm not getting notifications for the full set of things worth checking.