On: 'It's better for humans in general': The 4-day wor...

[card_zero]

Or to put it another way, September 1926.

https://content.time.com/time/specials/packages/article/0,28...

Also: ancient Rome, one day off in eight, revolutionary France, one day off in ten, Han China, one day off in five.

https://en.wikipedia.org/wiki/Workweek_and_weekend#History