Because, you know, it comes back every two seasons.
In college lacrosse, rules are modified every two seasons, and 2013 is a rule-changing year.
Although umpires can technically work the tournament every four seasons, the number of qualified officials means that each of them might receive only one opportunity.
McCoy need not wait long for a shot at revenge against his former team: the Bills visit Philadelphia on 13 December, a fixture that happens only once every eight seasons.
That decline might make sense considering that the strike zone, the ballparks, the ball and steroids all conspired to boost offense, yet there have been 10 perfect games in that span, meaning they are now coming along every three seasons on average instead of every seven.
Warburton warned that fatigue could be a contributory factor in many injuries, and believes international players are likely to suffer significant injury lay-offs every three seasons.
But with the club posting losses of nearly £1m in April, and with an academy that requires the sale of a £1m player every two seasons, Powell's departure could be on the cards sooner rather than later.
Series creator Peter Morgan reportedly has a six-season plan in place that involves new actors joining the cast every two seasons to play older versions of the characters.
A token amount of plot: Every thirty seasons, a mythical dragon 'the world-gobbler' returns to wreak death upon the lands of Lord Arnold.
Every week for five seasons, he gave away a cashier's check for $1 million, tax free, to a deserving stranger.
