I was pretty great when working a blue-collar industrial job. I'd work 6:30-5 (unpaid half hour lunch) monday-thursday one week, then tuesday-friday the next. So you'd get a four-day weekend every other week, and if there was extra work, you'd get time-and-a-half for it. A ten hour day wasn't bad, because you went until 9, had a half hour break, went to noon, ate lunch, went until 3 and had another break, then closed out the day until 5. It was almost an extended pomodoro.

Even now, programming on salary, I'd rather do 4 tens, 7-5. The overhead of commuting is what kills me, and it'd actually be less traffic if I went in earlier. Besides, those two hours before everybody else gets there could be more productive than the whole rest of the day.