Leaver Buster

Leaver Buster is an automated system that Riot implemented to discourage players from leaving the games.
 * Leaving the game during champion selection.
 * Punishment: 1st offence - 5 minutes prohibited from joining the queue. 2nd offence - 10 minutes prohibited from joining the queue. 3rd offense - 1 hour prohibited from joining the queue.
 * The counter resets after 8 hours.
 * Leaving the game before the match is over
 * Punishment: no XP/IP granted for the game the player left. Consequently, the player will not receive the IP bonus for playing a streak of games without leaving for the next 2 games.