No, I don't think there's a formula. I was just saying that ~200 is too many for my interest.Just divide by 20 then, multiply by however many levels you want to reach.
Do you want a campaign to consist of 1*levels combat and 1.5*levels other activities?
So a four-level campaign is 4 combats and 6 other activities like tracks and wounds?
4-10 combats/events would be a decent "short adventure" somewhere between a PFS scenario and a module.