Average life expectancy of mask with no care(worn)

I’m guessing you spray the inside and outside?

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[/quote]I’m guessing you spray the inside and outside?

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[/quote]

Id like to know this as well

Well the key to your question is the “no care” part. That makes the answer completely random.
While with care, and it is super easy to take proper care of a mask, it will easily last more than 10 years, the rest of your life in most cases.