I do the same. Over time, I've learned to space some of the starts out and have a few things in different stages of production. (for me, artwork is the major one).

This spreads out the tedium. I'm not spending 10 hours in one go completing something: I'm spending a couple of hours on it, then moving to a different piece and a different task.

When I'm in a good flow, it works out really well. And sometimes I find I finish a few projects in a short time.