That's how long my deodorant offers me protection for. Ridiculous, if you are such a smelly fuck that you only wash every four days then you wouldn't bother wearing any. Don't give me any shit about festivals either.
I'll accept a 36 hour deodorant but no more! The minimum they sell is 48... 48 hours.
Where will the deodorant underarms race* end?
*I didn't come up with this thread for that joke. It is excellent though.