[pc86]

I've never been the most productive person, but I find myself hitting a wall once I use about 15-20 of those 62 hours on a side project. For my schedule and life, that's the point where it starts impacting things like sleeping a full 8-9 hours and eating healthy meals at regular times.

YMMV and I've known people who regularly put in 35-40 hours of side project work on top of a 40+ hour job, but they've certainly been few and far between in my experience.