Without fail the class would end a few minutes early. As soon as I started making the sounds it was like dominoes. Ten minutes left in the lecture but everyone has all their stuff put away and are putting their coats on. I think of this often. May this knowledge set you free a few minutes early.
During high school I’d always hang around the class room after class to chat with the teachers; mostly because a large part of the other students were bullying me at the time and I wanted to avoid them/take my mind off of things.