[ido]

I don't disagree with anything you said but I just want to point out that this is very individual. Some people (not me) really can work a lot of hours and be very productive in those hours.

I can do it for a short amount of time (couple weeks per year maybe) & need to rest afterwards, with my usual leisurely pace being about 6-7 hours per day, 5 days a week. I've known people who were able to get 50+ (sometimes a big +) hours per week and get a lot done consistently. Others get stressed by half as many hours.