I agree with all that. The only thing that puzzles me is that it looks as if you expect me not to, and I'm not sure how I gave that impression.

Perhaps I should make it explicit that my comment four upthread from this one wasn't in any way trying to suggest that employers can be relied on to do what's best for their employees, or to criticize you for your choice of jobs, or anything like that. I got the impression that you were suggesting that the question of what working hours lead to max productivity is a duly one or a boring one or an improper one, which I don't think it is even though employees should be thinking about other things besides productivity-maximization.