We have back to back special scheduling. Thwherever possible, the principal plans two specials one after the other. No room for late classes, no time to clean up or get organized. So we specialist complained and asked for time between classes.
Some teachers hate the down time.
They use it for getting drinks, bathroom breaks or short recesses in nice weather. The specialists LOVE the down time. We think 30 minutes is too short a time for a class, but that is the way we have done it for almost 30 years.