I agree that 10 minutes may be a lot, but with only a 2 minute penalty people will still quit out of games. It doesn't even need to be a time penalty. They just need to come up with something to keep people from dropping out of games on purpose. It is extremely frustrating and ruins the game experience. They could even have a non-ranked queue that allows people to drop and even join mid game for those who want to play solo queue. As it is though, one man down is an extreme disadvantage.