oh wow you just admitted that you don't want to learn any new information, that explains a lot.
And I did research about surgeons changing masks during surgeries, and you were right they do. it said that a surgeon should change their mask after surgeries and after at least 2 hours of longer surgeries, so they have to go 2 hours without any oxygen, sure...
Maybe you don't like research because of how easily any research can make your arguments completely shatter.