The problem is what constitutes "maintaining a living", both in your own choices and governmental influence. I can show you how to live well on $10/day, but then you'd complain about not having X Y and Z (starting with two cars and a mortgage in a narrow geographic range).
If you can't do without what amounts to luxuries to 75% of the world population, discussing how many hours a week you "should" work is a non-starter.
If you can't do without what amounts to luxuries to 75% of the world population, discussing how many hours a week you "should" work is a non-starter.