We have 2 x (2 vs 2) going in each end zone at the same time. At the whistle (30-60sec.) both 2 vs 2 race to opposite end zone and battle for another 30-60 sec.
Then 2 new set of 2 vs 2 enter the zones.
Notes: It is important that the players leave the puck behind at the whistle and race down the ice.