The Scheduling Time Threshold does not affect the start and end time of events, but occupies the room(s) for a specified number of minutes before and after the event.
Events that overlap each other are marked with a warning sign: . This means, that there weren't long enough breaks left before and/or after the events.
Example: If a 15-minute scheduling time threshold is set, there has to be at least a 30-minute "break" between events that are assigned to the same room: 15 minutes after the current event and 15 minutes before the next one.