Pro on court scheduling (different than event time)

Is there a way to split an instructor's time on the program court assignment?  For example, two Pros are needed on the court but one stays for an hour and the second only 1/2 hour?  This is very helpful, if it's a drill and play court, or Round Robin, or even to schedule Pros when they have to come off for a mandatory break ( dictated by NYS law).?