How Many Games Do You Have To Play Before Leave Buster Stops Stacking?

I will admit that I afk 1 in every 50 games or so because I get really frustrated with this game. I know people hate afkers, but people in this game really test your limits. You don't say anything mean, you ask nicely for them to not do something and they get all salty like you're demanding something of them. I try to be as polite and kind as I can be when I ask for something. Most times I won't even talk in game. Then people just start flaming me for no reason. Sometimes I let it go and sometimes I get snarky and reply back. At this point I rather get chat restricted (is this a thing in league?) by venting out how angry they make me rather than leaving the game to keep my sanity.

I'll go into a match and get abused constantly, I can handle that to some extent. Then some games people mess with me through gameplay, taking my cs, intentionally stealing my kills etc. I ask them to just leave me alone. I mute people some times, but after playing 10+ games with the same people and getting verbally abused each one just asking people to leave me alone, I just snap.

I've been playing mobas for like 2 years now, so I'm not new to them. I'm use to people not really talking since my favorite moba atm is Vainglory. I don't tilt nearly as hard in that game as I do in league. I'm to the point now where I tell people to stop or I'll afk. I'll be farming, they'll come take 2 waves of my cs. I'll say "do it one more time and I'll afk. Try me". And then they'll come and do it and say "Get the f*** outta my game* or something along those lines.

tl;dr

How does Leave Buster works? I've played 62 games since my last leave buster incident and now it's stacked to 20minutes. How many games do I really have to play without afking for this to change?