I use what's known as a bath sheet, or an extra large towel. It is necessary when you have hair that goes halfway down your back, And a hairy body that holds water like a sponge. Sometimes if for some reason l'm away from my big towel, I have been know to use 2 or 3 towels to get dry, If they are small ones.
And it gets washed once a week, Anything more is a joke. If you took your shower to get clean, And then feel that the towel you used to dry yourself 15 seconds after your cleansing process was complete, I would question if you did you job in the shower, And seriously look at the procedure in place, As it may need some adjusting. Generally as a good rule of thumb, You should feel clean for at least an hour after a shower unless you are doing some grueling activities, Such as running from bounty hunters, Or just simply living in Florida or another always humid place.
That is all.