I can go 55-60 hours/week at a pretty good clip, but the fall-off after that is drastic, and I can only keep it up for a few months before everything starts to

I can go 55-60 hours/week at a pretty good clip, but the fall-off after that is drastic, and I can only keep it up for a few months before everything starts to get sad and depressy. 50 hours/week is probably a sweet spot for me.