At work, hours. But then I'm an IT manager trying to keep 3 different systems running. Luckily I can smoke at my desk. I do have to get up every couple of hours to get a caffine fix or to teach people that printers won't print when out of paper or not turned on. At home, hours. Doing my art is relaxing after a day at the office. Especially when nothing's on TV. As long as I got my smokes and some sort of caffine I'm happy.