Only three but in the Major League Soccer (MLS) there is five.
Each team starts with 11 players and are allowed to use a maximum of 3 substitutes, therefore the maximum total number of players in one game is 24.
There are 16 players in a field hockey team - 11 on the field and 5 substitutes. There is no limit on the number of substitutions allowed during the game, and they can happen at any time except during a penalty corner.
There is no specific number any number of claims is allowed during the policy period. However the sum insured is the maximum limit under the policy.
FIFA, the international governing body, mandates that in international matches ONLY THREE substitutions be made. However, many youth leauges modify this rule to unlimited substitutions.
the number allowed per manufacturers specifications
The minimum is 45 with a maximum of 55.