I sometimes stay up to 15 minutes. I like the warm water. But then I usually take my waterproof notepad with me to jot down ideas or brainstorm stuff (relaxing shower works wonders for creativity).
I got trapped in Seattle a couple years ago after some flight cancellations some former students of a colleague put me up for a few days. They had a waterproof notepad suctioned to the wall of their guest shower and each morning I would draw out detailed diagrams of locks & methods of attack. I found it was a bit frustrating to get a good transfer onto the pages, but really liked the novelty of being able to take "shower notes".
