I once had a job where i sold cell phones and was expected to bust my ass the entire time, which was a bit unrealistic since the mall we were in was completely dead. As much as i loved the other staff there the owner signed all the wrong exclusivity deals and was actually scared to death of technology. Long story short, there just wasn't a lot we could do. I would sa i did 0-2 hours here, even though i honestly tried to do more. Shortly after i gave my notice the HR manager (one of the two other permanent employees) was sent over to fire me (even though i had already quit) for being late twice in two weeks, she gave me a hug.
My next job was at a newspaper where i worked my ass off(6-8 hours with intermediary deadlines) but if there wasn't any work they let me do whatever. Then i got laid off because of the recession.YAAAAY!!
Anyways i can definitely say i enjoy jobs where i actually work more. Slacking isn't a natural state for me.