Is it normal to shower every three days?
Depends.It depends
Yes, showering every three days can be perfectly normal, especially if you don’t get very sweaty or dirty between showers. Your activity, climate, and skin are better guides than a strict schedule.
There’s no single shower schedule everyone needs. If you’re mostly indoors and your skin tends to get dry, every three days may work just fine. If you exercise, sweat a lot, work a dirty job, or live somewhere hot, you may want to rinse or shower more often.
In between, you can wash your face and the areas that get sweaty or smelly—like your armpits and groin—without doing a full shower. If you feel comfortable and clean, your routine is probably doing its job.