tl;dr: I don’t know. But YOU should achieve it!
Some swear on only working a few hours each day, but have maximum focus and productivity in that time. Others would never work on weekends, to get time off for friends, family, sports and leisure. On the other hand, there are many successful people who are working 90 hours a week. There is a famous quote that Bill Gates never took a day off until he was 31.