Purking Technology (Zhejiang) Co., Ltd. will answer for you whether the mask can be worn all the time: when wearing N95 masks（5mm nose bridge wire）, the time cannot exceed 4 hours at a time. If you continue to use N95 masks for a long time, it will cause lung damage, and severely may cause lung gas. Problems like swelling.
So what should I do after taking off the mask? It is best to prepare a plastic bag for unused masks. The exposure of exposed masks to clothing or other things will increase the risk of transmission.
When removing the mask, try not to touch the outside of the mask. Remember to wash your hands immediately after removing the mask. Try not to reuse disposable medical masks. Once the mask is broken or dirty, it needs to be replaced with a new one immediately.
As for how long a mask contaminated with the virus can still infect, relevant virus experts said that COVID-19 is an RNA virus, and the survival time of the RNA virus from the cell in the air is currently uncertain, ranging from a few hours to a few days.