Racers please chime in--Thanks
thats just what I do. that doesn't mean it's the standard. on an average you have to win about 6 or 7 rounds at my home track to win the race in Modified Eliminator. over the course of 4 races I will usually average going about 15 rounds. then add in 2 practice runs before each race starts for a total of 23 passes give or take.
so if you wanted a round number, about every 20 to 25 runs. thats just me.
I do it every 4 races because its easier to remember, once it becomes habit, than keeping up with how many passes I've made.