Good question. And that depends on the sex and age of the user. A normal teenager spends more time looking at the mirror and doing extra personal beautification than taking a bath. There are even some who stays more than an hour and that is so personal. There’s no problem about whether you spend long or short time inside the bathroom. That is so normal. Most kids don’t want to stay inside bathrooms because they prefer staying outside the house for fun.
That is the reason why mixer showers and shower enclosures are reserved mostly for adults. But not all cases are similar to these. There are even some children who don’t want to go out to take a bath. So the time you spend inside the bathroom also indicates your personality. Ask yourself and try to figure out how much time you spent yesterday inside the bathroom.