It was a booth review. They clearly took the clock back to 37 seconds, so what was on the clock at the end of the play, and ran 10 seconds off from there. Because when they stopped it to review there was 25 seconds left on the clock.
I don't know why it takes him so long to make a decision. Its pretty ***** simply send him out there or not. He should have a predetermined yardage spot and if it isn't made then you automatically go to a quick out. Not dick around to make a decision and almost get a delay of game.