With 4 hours per day of use, N95 masks retain ~95% efficacy after 3 days, ~92% efficacy after 5 days, and drop to ~80% efficacy after 14 days (source).
I think the paper you linked to reports on an experiments in which respirators were worn for a total of 8 hours per day, not 4.
I think the paper you linked to reports on an experiments in which respirators were worn for a total of 8 hours per day, not 4.
You’re right. I’ll fix that.