[CodeToad]

Your mask is shot within 1 hour. Your breath soaks it then it is useless.

[palmer]

I don't spend an hour in a store. I also know when my breath has dampened the mask. It happens sometimes and I ought to bring along a spare. I never wear a mask outside (I was forced to in RI once). I am using a mask in air conditioned spaces and it is not "soaked", but sometimes it does get damp if there's not enough AC.

[Mom MD]

actually 20 minutes