the rules are following:
Starter: 36 min
backup: 10 min (5 when player is a starter*)
Reserve: 2 min
the final minutes can be higher then 48 minutes, the maximum are 71(36 + 5* 5 + 5* 2)
* it is equal where he is a starter, when he is starter at PG backup as PF just gives 5 minutes