I think it takes around 30-40 minutes for most hot water heaters, the main thing I try to avoid is running our hot water heater between 11pm and 5:30am as we don't need hot water after 2am alot of the time and according to my room mate who took a 4am shower the other day "it was still nice, not scalding hot but nice" after 5 hour of being off, and it's set low enough that I can stand a shower with just the hot water on. so I know it's not to hot either.
If I had more tabs to turn ours on and off I would have it run from 5am til 7am and from 3pm till 6pm and maybe again at 10pm to 11pm as we still live in a state that allows smoking in bars, and the best live music is in bars.
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