Because of work I shower twice per day which is once in the morning before work and then again at night before I go to bed.
To keep your skin healthy and your hygiene in check once per day showering is enough if you don't have to go to work.
Showering more than twice per day though can strip your skin of essential oils which keep your skin moist.
If you need to shower more than twice per day you should use a moisturizing body soap to keep your skin from drying out.