The lifetime of the FFP2 / N95 masks is specified as 72 hours after being worn on the face. In other words, after wearing the mask on our face, we can use it for 72 hours continuously. The biggest confusion that comes to mind in this part is 'Since I cannot use it continuously for 72 hours, can I use it by plugging / unplugging until it completes 72 hours?' is the question. The answer to this question can be expressed as follows: After removing the mask without touching the front surface in accordance with the rule, it is to be re-used by providing ventilation. However, considering that this method is not very healthy, it is the best time to use the mask after using it during the day.