There was a story I read about the Carnegie steelworks end of the 1800s. Usual working hours was six days a week. Then the plant manager introduced a 40 hour week. Productivity went up and less accidents happened. This went for a while until the manager got killed in an accident. Soon after, despite the good numbers, the plant went back to the old schedule. I think it’s hard to shake the belief that the more hours you work the more you get done.