>when you do it for 15+ hours a day every day for an extended period of time Does this happen? I've programmed daily for ~11 hours/day between 2 companies, but

>when you do it for 15+ hours a day every day for an extended period of time Does this happen? I've programmed daily for ~11 hours/day between 2 companies, but at 15hrs/day I feel like there is diminishing returns.