Ball is out of play mainly in an U8’s game when the player’s run out of the field of play and then have to form an uncontested line out which takes up to a minute. Considering that U/8’s try to run round the opposition this happens quite often. Also, when a player drops the ball and uncontested scrum is also formed. I also coach Brothers Premier Grade and ball in play is between 25-30min a game which only represents 30-38% of ball in play.
Rugby union vs rugby league: A footy dad's 'little experiment'