Sure it is nice getting 3 day weekends but I am not cut out for 10h days. I just cannot be productive that long.
There’s a strong argument that people also can’t be productive for 5x8h days. Cases of the Mondays, Friday afternoons, just staring at the wall. I think a fundamental aspect of the standard workweek is a lot of employees are sometimes just at work without actually being productive. That’s why some studies find no reduction in productivity when people go 4x8.