> more commonly it's an 8 hour day for 4 days a week with an assumption (proven in many studies) When I looked at these studies, the productivity was measured

> more commonly it's an 8 hour day for 4 days a week with an assumption (proven in many studies) When I looked at these studies, the productivity was measured by company's revenue, so it was pretty much useless. > people work harder with less downtime for that 8 hours so consequently get the same amount of work done as their 10-hour-4-days and 5-day-week counterparts. Maybe it works that way for some people, but I doubt for all. Personal anecdote - I don't work full 40 with full intensity, I do slack a lot. But it's not like I work hard for the first 32 hours and then slack all Friday. It's more like I work hard for 2 hours and then slack for the next hour, because the mental load is just too intense. Rinse, repeat. Another day off won't do much for me in terms of productivity. On the opposite, I believe I'm less productive on Mondays and even less after longer holidays (I believe it's basically loss of context and "work mood"). I personally also do programming in my free time (usually at least an hour a day), so it's not like the overall load is too much. Having said that, I would love to have a 4-day week, especially without lost compensation. But to me this idea that there's no productivity loss looks to me very much like wishful thinking.