This is a little ridiculous....5 games???
I'm glad League and eSports in general has gotten visibly less tolerant to toxicity and afking, but there ARE exceptions!
I was in a ranked match and we were playing pretty well and suddenly a fuse blew. To compound this, i haven't optimized my pc in a while and my boot time is long af.
all in all, it took me roughly 7-10 minutes to get back into the game.
Now, idk how leaverbuster weights its penalties, but I'm assuming its by damage done to your team/towers while you were away because of course, the other team capitalized on me not being there. So, even though I was gone for only 8 minutes and then came back fighting hard to keep my team in it,they were a CRUCIAL 8 minutes, but there was literally nothing I could do to get into the game any faster.
My team was upset, but understood and wasn't overly toxic about it, but I still got leaverbustered and put in lower queues for 5 games. 
I know it's an automated system so i'm hoping rito makes exceptions when life actually gets in the way.