when training 4-5 players you would want to train 2 positions. With the scrimmage game you have a max potential to train 6 players, but probably impossible to get 48 exactly to all six. Pretty easy to get four players to 48 minutes in two positions though, and sometimes if the minutes fall good, you can get 5 at 48.
And the players can split their minutes between the positions, so if you train PG/SG, a player can have 30 minutes at PG and 20 minutes at SG, and he would get the full training. Hope this helps.