Kids in my school that are between 9-11 where a mask for 4 plus hours with a few breaks a day with no problem . My 3 and 7 year old too; no problem. I teach all day with it on ; no problem . Is it annoying , yes ; but there are far more annoying things in this world such as a bunch of fake tough guys who want to show how tough they are . Newsflash , these kids are much tougher than all you .