Rugby sevens is sanctioned by the International Rugby Board (IRB), and is played under substantially the same rules and on a field of the same dimensions as the 15-player game. While a normal rugby union match lasts upwards of 80 minutes, a normal rugby sevens match lasts approximately 15 minutes (allowing for the one-minute halftime break, injury time and so forth). Competition finals last somewhat more than 20 minutes; each half in a competition final is ten minutes instead of the normal seven minutes, and the halftime break can be two minutes. (In the IRB Sevens World Series, only the Cup final, which determines the overall winner of an event, is played with 10-minute halves; all finals for lower-level trophies are played with normal 7-minute halves.) This allows rugby tournaments to be