Apart from hacking away at the computer (I also do it for 8 hours a day at work), I cook daily dinners/breakfast as a hobby, I spend lots of time with my girlfriend (easier when you live together) and I try to generally disconnect from the computer for a few hours a day wether it be right after work or later at night
Some nights I won't even go near the PC except to turn on a movie, and some nights I will come home and work all night on the computer. It varies
If you let any one thing consume all of your time then you're missing out on all the beauty and diversity the world and life can offer.
Feed your brain new experiences and it will reward you.