Earlier quoted context omitted.
I don't agree, humans worked for 80 hours a week and then together reduced to 40 hours a week. I don't see why they could not reduce it to 30 or 20 hours a week. Everyone worked on a Saturday then suddenly most of the people stopped working on the Saturday, I don't see why it would be impossible for most of the people in the society to stop working on Friday too.
Because 40 hours a week are, if you remove vacations, holidays and sick leaves, on average roughly 4 hours per day. That's the amount tribal people work per day. There is no inherent human need to reduce that time further. As I said, people can already work for 30 or 20 hours per week. Why is it not enough for you if you stop working on Friday? Do you want 30 or 20 hours per week with equal pay? Then indeed you have…
I'm sorry, but who told you this?
The median amount of PTO in American companies is 10 days + 8 days of Federal holidays. That 18 days vs 260 weekdays, or 7% of the work year, meaning the average American works 7.5 hours a day, not 4.