I have a friend that works from 8-5, Monday - Friday. She works in the accounting department of a company nearby, and she's paid hourly.
As soon as 5PM hits, she is out of the office. She finds it strange that I sometimes stay later than 5:30 at my job, but I've told her that there are things that need to get done, etc. Also, I don't want my boss to think of me as the girl who races out as soon as the clock hits 5:30. I'm salaried, so I don't get overtime.
So, are out the door right at your scheduled departure time? Or does it depend on the day?