Do you limit your teens shower time?

My 13 y/o son is taking 20-30 minute showers (not sure if he's actually IN the shower this whole time) every morning before school. HIs step-dad has a major issue with this and wants to limit the time. I don't disagree that he could hurry it up a bit, but I don't know that it's a battle to fight.

Less than 2 years ago, we had to fight to get him to shower at all because he literally stunk. Not sure what kind of message this well send. Step-dad mainly brings up how much it costs, by no means are we rich, but we're not struggling to pay the bills.

Hubs and I were raised VERY different, he had super strict parents, and I did not at all, so we disagree on a lot of things and I'd love some other opinions.

EDITED TO ADD: No one is waiting, we have TWO other showers. He’s not late for school. He does not have a lock on his bedroom door! Old house/door, needs to be updated just haven’t yet. Makes sense he wants some damn privacy.