5. Hockey
TEAMS AND DURATION OF PLAY:
a) A game stall be played between two teams. Not more than eleven players of each team shall be on the field of play at the same time. At no time shall there be on the field more than one goal keeper in each team.
b) Each team is permitted to substitute up to two players during the game. (This provision is not mandatory at any level.)
c) No player once substituted shall be permitted on the field again and no substitute shall be permitted for a suspended player during his suspension
d) Substitution of players may only take place with the prior permission of an umpire during any stoppage of play other than for the award of a corner, a penalty corner, or a penalty stroke. Time may be added for substitutions.
e) The duration of the game shall be two periods of thirty five minutes each, unless otherwise agreed before the game.
