Showering. How do people do it in <30 minutes, and cleanly?

For the past few years I've been struggling with showering. I avoid it like the plague, waiting until 8-9 PM typically before taking one. As of writing this I've been stalling showering for 2 hours. Why?

Because showers take me 40 minutes, and I can never make that faster. And that's only doing hair, face, arms, pits, privates, and ass. So to look up advice from this sub or elsewhere and only seeing people add more steps is frustrating to say the least.

How do people do it? How do people shower in only 15 minutes or less? How do you know whenna part is "done"? Wiping the ass is the absolute worst part, and that alone takes 15 minutes. And people say to go top to bottom? Wouldn't that literally involve wiping shit all over your legs and feet??? I literally do not understand it. Do you just only wash the cheeks and nothing else?

I want so badly to shower faster but it never happens. I do my hair, arms, and face, and 15 minutes have somehow passed. The advice never makes sense. Half of it feels vague enough to be disingenuous. Especially when it comes to the ass, its a fucking black hole for time and by the time it's over, I feel violated, like I've invalidated the entire shower, and that my arm's going to snap off like a twig.