How much time do you spend on a PC per day ?

hahaha damn your question makes wonder about my life. Last 5 years I spent well over 12 hours per day on my computer. Not normal sleeping patterns either.I''m 38 half of my hair is already gray , first gray hair was after heavy use of old tube monitor 17 inch..playing dota all afternoon and night instead of studying for the university...what a great devil computers have been for me. But I wouldnt change it except perharps control myself more...