One company I flew for kept one away from home for 18-20 days at a time living out of a rollaboard. Not being particularly accurately scheduled it was a bad idea to hand a uniform over to the hotel laundry to clean and press as they aren't open at 0200 when we tended to get the phone call to man up. There are pilot uniforms in laundries all over the planet gathering dust from freight crews that took the risk and never were able to pick them up.
I used to carry a small bottle of laundry detergent. Wash 3 or 4 days of underware in the sink and dry them with the iron just to stretch the time out until I had enough ground time to launder everything.