agreed. was just thinking about the shuffling in/out time of a few people - getting seated, checking if a projector works, etc. that's easily 1-2 minutes at t

agreed. was just thinking about the shuffling in/out time of a few people - getting seated, checking if a projector works, etc. that's easily 1-2 minutes at the start or end - 6% of the time gone!! edit: the time to get up and lock the door, then unlock it, and to likely admonish the person who was late - that's also wasted time.