"If they smell bad", which varies dramatically: last year I had a full outfit of clothes get fairly strongly vetoed because they simply reeked of wood smoke on account of a simultaneous pit, salt and wood-fire weekend, resulting in a nice solid day of burning shit.
More recently, it's been raining: the damp, moldy smell really bugs me. So after a thorough soaking, a pair is pretty much done until the next batch of laundry. And sometimes I accumulate so much rust/glaze/clay/soot/mud/food/crap that I veto them in a weird sort of aesthetic surrender/wimpdom, but that rarely happens before a funny smell.
So on average I would say 3-5 times.
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