First thing is to verify that the hot water is so hot that you can not put your hand in it without burning it. I a shower you will use more cold water than than hot water.
With short hair a shower should use about 1.5 gallons. With long hair about 2.5 gallons. The water heater holds 6 gallons. Assuming 50-50 hot and cold water you have about 12 gallons to work with for back to back showers. We can get 5 adults showered before we run out of hot water, 2 men and 3 women.
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