Every day except maybe weekends...
...since 1982 when I joined the forces. Although, the dress and appearance regulations require airmen to be clean shaven (moustache and sideburns allowed, with size restrictions) at all times.
Since I retired, I have had a full beard for awhile, and have grown a couple decent goatee beards, also. But, even with a beard, you still have to shave the outline every day or so, unless you don't mind the beard growing down your neck a la hillbilly. I used to have a nice read beard, too. That's the one thing the Air Force took from me. My red beard. It's half grey now, of course.