i do our regular laundry about every two weeks. but i have to do a small load of work clothes almost every night, because i get very dirty at work.
i do all the laundry for my girlfriend and i. we aren't picky, we throw everything in together, except for red clothing seperate.
i also only took one shower the whole trip (4 months), but that is probably too disturbing to even think about.
but usually i wear jeans for about 3 days.