There's no reason it has to take 2 minutes. There's no reason it has to take longer than 30 seconds with the technology available. If you can't decide conclusively after 30 seconds, the call stands. Just have a replay official already looking at, don't have the entire crew disappear into some tunnel and then come out with the wrong call because their egos are too big. I'm not crazy about the NFL system, but I'm in favor of anything that leans towards getting the calls right. They have just as many reviews in college football now, but they do it right and it's not extremely time-consuming. People also exaggerate how many "review" calls would take place in a game. In an average game, you might have 3. At 30 seconds each, that's 90 seconds, probably comparable to one manager/umpire argument. Yes some games you are going to have more, and some you won't have any at all. They're not going to review a guy being out or safe at first when the whole world saw him get thrown out by 2 steps.