Please people, step out of your USA bubble.
I (Dutch guy) haven't had a more than 4 day workweek in the last 20 years.
It is _your_ choice to "work" 5 days.
The 40 hour workweek wasn't created for the worker's benefit, it was created because the owner of the factory saw that that was the most efficient. Paying people to work longer didn't give him benefit.