A game of American football, although it usually lasts more than three hours, only contains about 15 to 20 minutes of action. Lots of waiting, scurrying around, chatting, huddled together, queuing up, yelling, watching, yelling some more, then an inevitable time-out whistle so there can be a long discussion with the coach, multiple times, standing in line ​and scream. When the ball is finally snapped, the actual play lasts, what, 10 seconds?

And while everyone involved is back scurrying around, it’s time for us to watch that 10-second action in slow motion instant replays from 14 different angles that could last several minutes. Hence the playing time of three hours.