I'm dumb, and looked up the Soviet Air Force numbers on Wikipedia. Ballpark, you have about 750 multirole fighters, 450 ground attack, and 1400 or so helos of various types. These are very rough numbers, I looked at what they were likely to use and ignored heavy bombers, transports, one-offs, etc.
So...2,600-ish frontline aircraft that routinely operate in a Stinger's envelope. If each a/c took 5 missiles to kill, you'll need 13,000 Stingers.
Or 26 days at Ukrainian numbers. That's assuming that every frontline Soviet a/c was committed, attacked, and destroyed.
10 missiles per kill is 52 days @500 missiles at day.
The Ukrainians are out of their goddamn minds. I am all for Team Ukraine, but someone needs to slap them upside their heads and ask hard questions.
List of active Russian military aircraft - Wikipedia