How Long Can Different Models Of Masks Be Worn At Most?

Masks worn by healthy people do not have the risk of spreading the new crown virus. Surgical masks are generally replaced when the mask is deformed, wetted or soiled, resulting in reduced protection. 

The longest use time of disposable surgical protective mask is 4 hours, and it should be replaced immediately after getting wet. Masks above the N95 level can theoretically be used for 1 to 2 days, and disposable N95 masks cannot be reused after they are taken off.