How Many Weeks Did It Take You to Build a Better Mask?

Istarted in july of 20 20, and we were talking with manufactures in january of 21. The purpose really is to stop source spread o large, medium droplets but to have some level of aerisol protection. It's almost shocking, like the first time you put one in these on, and you're like, low,. i'm hearing my voice the way i'm used to hear my voice - which has never happened with a mask before.