In a move by the IRB in November 2010 to allow tournaments have up to 15 minute breaks, they have defended their decision as they claim the norm is usually closer to 12 or 13 minutes.
However, the Aviva Premiership in England takes the full 15 minutes which sometimes results in the players taking to the pitch early to warm up again. They say this is to help out spectators and avoid crushing in toilets and food & beverage kiosks....