I take 10 to 15 minute long showers and wash and condition my hair once thoroughly. However I have a friend who takes 45-60 minute long showers and washes his hair up to 5 or more times. He also hardly leaves the house so it's not like he is working 12 hour days in the jungle as a logger. He can't be THAT dirty.
Is it normal or is he just the next Howard Hughes?
Is it normal or is he just the next Howard Hughes?

I like to listen to music and drink a few beers while i'm in the shower!
He's either relaxing or wanking. Or both.
If he needs to take time to relax under the hot water, he could rather just bath. At that length, it's probably more economical on water as well.
But I don't know, if he has little to no hair on his head, there's probably a possibility that he's taming the mammoth. You should just come right out and ask him why he takes such long showers.