The 3M N95 masks are each good for up to 5 full-time uses before they should be discarded. Obviously if you choose to wear lipstick and foundation under the mask, or eat a really greasy pizza right before putting the mask back on, or sweat a lot while wearing it, it won't last as long.
If you wear a surgical mask under the N95 mask (some people do) then it'll probably last even longer than 5 uses.
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