Your lucky to be able to play that much. I only get to play for about 3 or 4 hours per week, usually after 12 at night after the my wife is asleep!
Seriously though, I used to play a lot more but found that I wasn't improving much. I only started getting serious increases in ability over the past few months.
Since I can't get to play that often I spend a lot of time listening to whatever I am currently recording, then going back and re-recording new ideas. Just by listening to it over and over I get much better ideas than I would by jamming something out on the guitar. Its strange but the less I actually play the better my technique becomes... It's a tough one to prescribe though... "Try playing less guitar if you want to get better"!