Masks gets moist over time and virus will build up in it, are there any tests checking how well they work after a full workday? It wouldn't be strange if the vi

Masks gets moist over time and virus will build up in it, are there any tests checking how well they work after a full workday? It wouldn't be strange if the virus buildup on the mask pretty quickly makes you start spreading covid, and then the false sense of security would actually cause them to increase spread rather than reduce it. Edit: Also that is for surgical face masks, most people just put a piece of cloth in their face. I would like to see a study for a piece of cloth in front of your mouth for the entire day and see how much virus there is after that.