I always believed that if you watch a clock while smoking then you are missing the point in smoking in the first place. Smoking is to relax and enjoy the many pleasures that it holds. If it takes you 10 minutes or 2 hours it is what you get out of it. I have seen people puff like a freight train and love every minute and I've seen people smoke that you wonder if the pipe is lit. They all enjoyed what they were doing and that is all that mattered.