I arrived at school today at 6:36. I usually arrive some time between 6:30 and 7:00. By contract, I don't have to be here until 8:00.
The time I leave varies so much that unless I logged it, it would be difficult to figure out the exact average. Looking at last week, there was one night when I left for 30 minutes to go out and get dinner; I was here until 8:30pm (so, 13 1/2 hours), and another day when I left from 5:30pm until 7pm, and was back here until 10, another 13 1/2 hour day. The other days, I left some time between 4 and 5, or just after 5; so about 10 hours each day.
The week before was homecoming week, so I was here even more; chaperoning the dance, attending several sporting events (we don't get paid to do so, but our new evaluation system mandates that we attend a lot of school events, else get dinged pretty badly.)
Bow season is coming up, so hopefully by then I'm prepared enough for those weeks that I can get right out the door at 3:15.