How many bans until a Permanent?

[Bearzky]

Hey guys, just got back and I saw a notification. My ban request against (User who Shall not be named) was accepted by Aviator, but when I looked at the time it was 30 days, now im not quite sure about this but my real question here is how many times can you get banned until a permanent, because the User (Shall not be named) was banned 12 times and that was his 13th and somone told me your only allowed 13, well anyways and thank you for whoever took the time out to read this. - Bear