I work 40 hour weeks. Nine to five. I got into the habit when I started my PhD, because I knew that if I didn't force myself to work to a certain schedule, I'd probably slack off.

If I only worked when I felt like it, on what I felt like working on, I would never have finished my thesis because, heck, who wants to do proofreading when you could be at the beach? And if I ate whatever I felt like, whenever I felt like eating it, I'd weigh three hundred pounds.

Anyway, the point of the story: if someone forced me to work nine to five, I'd probably hate it. But since I get to pick my own hours, I've picked nine to five.