Once a day as maintenance / 5 minutes (get the creases, shave minimally)
once every 3 days as full / 15 minutes (hair, smooth expanses, exfoliate a few areas)
I find that the 'full' shower just dries up the skin too much, to be a normal thing. I believe the hair looks better with a good bit of 'refuel oil' left on it for a few days. Maybe not aesthetically pleasing, to some.. but it keeps the strands stronger, methinks.