Under normal circumstances, one day cannot be taken. Disposable masks can no longer be used after being worn for four to six hours. If it is used continuously for one time, generally it will be replaced within four hours. Of course, if you just put it on your mouth and nose intermittently and take it off halfway to breathe in fresh air, then the time can be slightly longer. After the mask is used for a long time, the filter layer inside the mask will be blocked by various tiny particles, or because the mouth and nose exhale the humidity of the gas, the mask will be wet, and the protective function will be lost.