My point wasn’t that 4 days outputs more work than 5 It was that the average output per day decreases with a longer work week, though one or two people we work with manage to be pretty consistent.

Also I think that 4 days of productivity is enough.

Our most effective co workers have had special work hours and agreements. Some worked 4 days on 3 days off, some work 3 hours less a day. They are the ones who consistently pushed out good stuff, were the least distracted, and had the space to occasionally work extra if they felt like it. The only reason they could do that was because they didn’t rely on the 5 day work week to keep themselves afloat.

I wish I could be in that boat but unfortunately my wage means I have to work all 5 days to support myself and family comfortably.