But VC investing is a hit-driven business. One big hit, like a Dropbox, funds all the rest. Unless you're really good at picking horses, you'll have the same median as everyone else.
Because your VCs will go crazy if they found out you were only working 8 hours a day. I've interviewed with both TechStars and YC startups - and they've told me that 55-60 hour work weeks are the norm. Damned if you do, damned if you don't.