I was able to work 4, 10-hour days in a previous position. It was great having the extra day off, and an extra day of no commuting cut costs a bit. What I liked about it the most is that we had a 5-person team and we changed what weekday we each had off every week. So each of us took Tuesday off this week, Wednesday the next, Thursday the week after that. So every five weeks we had a four-day weekend; week 4 was Friday and week 5 was Monday. It only lasted for a year or so, unfortunately.