Leaver buster and how it works

I'm not sure if this is the right section to post this in so sorry if it's not but I had a question about how the leaver buster system works. I play a fair amount of league games and regrettably my mother has brain cancer and weekly has seizures that I have to dc from my game and go attend to her. I understand that I shouldn't play a game if I know I'm going to have to leave but it's random and can happen two days in a row or not at all in a month. My issue isn't with the fact I got a longer queue I understand that and accept my punishment for leaving but I was curious how they reset. Is it based on time like a week in between disconnects to reset it or is it like play 25 games without dcing. Ty to anyone who replies.