I would assume a lot. Pakistan said that they had over 20 jets flying and shooting missiles. And as much fun as we are having making fun of the rafale. Its no slouch and all Indian planes were flying over Indian territory. I would not be surprised if the number of PL-15s launched exceeded 30 or even 40.How many did they even fire… finding these things is pretty difficult.
Prior tot his the best example of long range modern kills we had were the Russian R-37ms and we know that most dont manage to hit their target but force the opposition planes to abandon missions.
If what Pakistan says is true and India had over double digit planes in the sky, it makes sense that a lot of Pl-15s had to be launched.