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I think it all depends on your motivation.
If you're trying to reduce energy use, water use and cost, you need to look at the shower time and the flow rate. I take a long shower, but use the shut-off on the shower head to produce a very low flow most of the time (e.g. when I'm shaving). My wife takes a much shorter shower but has the water blasting, so we probably use about the same amount of hot water.
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