My showers are usually pretty short and efficient, i'm a little compulsive about not wasting water. i'm that way with electricity too, i go around turning things off that were left on, i've actually turned the light of on people when leaving a room, i just forget there are still other people in the room, they'll yell heah, i apologize and tell them its a habit.
When i feel stressed or down however i'd like to stay forever in the shower. i'm very particular about water temperature too, i dislike very hot water or very cold, i spend half the time fiddling with the knobs trying to get the temperature i like.