I believe in a indefinite period of time rule. The food might pickup dust / mites / microbes, so what? There are dust/mites/microbes everytime you breath. You p

I believe in a indefinite period of time rule. The food might pickup dust / mites / microbes, so what? There are dust/mites/microbes everytime you breath. You probably swallow other people's shit particles several times a day. It's OK, you have an immune system that can deal with it. If you do (very very rarely) get an infection we live in magical times where an antibiotic pill will clear it right up. You could lick the floor at the sports stadium bathroom and you'll be OK. People need to stop it with the cooties crap.