I enjoy the 'zen' of the whole process, so I won't shave unless I have lots of time. It's also a lot safer that way. It usually takes me about 20-30 minutes from start to finish. This being said, a lot of guys do it in 5-10 minutes. IMO, 15 minutes or so is probably average. (Also, Kamisori's don't have scales that the blade folds into).