To add to this, there's a great book on the topic regarding the daily rituals of artists: http://www.amazon.ca/Daily-Rituals-How-Artists-Work/dp/0307273601 http

To add to this, there's a great book on the topic regarding the daily rituals of artists: http://www.amazon.ca/Daily-Rituals-How-Artists-Work/dp/0307273601 http://www.amazon.ca/Daily-Rituals-How-Artists-Work/dp/03072... It leads to the same conclusion -- 4 hours of work is about the maximum for any creative or intellectually rigorous field of work.