Why does younger brother take 2-3 showers a day?

The showers he takes are 1 hour long and takes them 2-3 times a day. He leaves the bathroom mat SOAKED and is home all day. I have way longer hair and take shorter showers than him. I'm complaining about this because I have to share the bathroom with him.
Why does younger brother take 2-3 showers a day?
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