Related anecdote. I used to do university 5 days a week, 9am to 10pm. Yeah, pretty competitive. Then I worked Friday and Saturday night 8pm-4am. I finally got

Related anecdote. I used to do university 5 days a week, 9am to 10pm. Yeah, pretty competitive. Then I worked Friday and Saturday night 8pm-4am. I finally got a small number of teaching hours which paid way better than bar work (non-tipping country), and thought, great, now I can study weekends too. Instead, I did absolutely nothing on the weekends. Slept. Hung out with friends. Played guitar. And my productivity, quality of work, and concentration span went way up for the five days of the week. Way up. Honestly, I actually feel I ended up spending less hours in the five days to do better work.