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Depends on how many people are waiting, how much time there is, and how big the tank is.
On the weekend, I'll take a nice long hot shower, maybe 30 minutes.
During the week, it's about 10-15 minutes.
I think once you get over 20, it's getting unreasonable.
When I was in high school, my brother would take long showers in the morning and use up all the hot water before I would get a chance, so I would go down into the basement and turn the hot water valve off on him when he was in the shower too long. I had to stop doing it to him though. He would return the favor when I was in there.
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