[{quoted}](name=The Big Piece,realm=NA,application-id=ZGEFLEUQ,discussion-id=HkyhZIsz,comment-id=00010000,timestamp=2016-04-23T00:57:16.108+0000)
As far as the automated system goes, never. Low priority que caps out at 20 minutes for 5 games. The only way to actually get banned from AFKing is if someone notices you doing it consistently and sends in a ticket to support.
Besides Rage Quitting, or Leaving a game because of a troll there are actual Real Life legitimate reasons to end up leaving a game I have always questioned since people take AFKing so seriously if your elderly grandmother takes a bad fall, should you go away from your keyboard to help her or ask her to hold on for 20 minutes, or tell a person having a heart-attack to hold on and wait while you finish their game because you can't go get their EPI-Pen injection because League OF Legends is more important.
Like honestly there are other situations where AFKing might be imo excusable due to weather related reasons, or natural disasters (Yes I understand a player going afk 5 times a week is always an issue, but I hope RIot never starts banning someone for going afk in 1 game out of every few months if even that or something.
I have actually hear of a case where parents neglected their baby because Video Games were more important, I hope this never becomes a issue with League OF Legends where a player puts the game first while there is a Real Life emergency, I already have told myself IRL that if I know something happens with my Elderly parents I am going to drop my game to go help them if I know about it, even my RL job at work if an emergency comes up.