Question

explaining our working hour changes overtime- differences between countries​

Answer 1

Answer:

There’s been a lot of work done over the years trying to explain differences in working hours across countries. For example, we Europeans usually work fewer paid, market, working hours than you Americans do. Yet when we look at unpaid working hours in household production we Europeans tend to do more than you Americans do. So much so that the average German housewife does, according to one study, more total working hours (ie, has less leisure) than the average American one.

Megan McArdle has a good round up of the general discussion here. She then provides rather a zinger, in the form of this paper that upends most of the assumptions behind the various arguments.