I say, as others do, just have a 15-minute quarter. If someone scores 6 points, the game is over. If the quarter ends, its either a tie or the team who is ahead wins.
If its a playoff game, then you just keep going until someone scores 6 points.
I can't believe Jets converted 3rd and 15, but either way, its a horrible OT system with the quality of kickers in the league now...