You can't get full minutes for one player, but if you put different players in different spots you can get the full 48 min between them. The max for a single player playing as starter, backup and reserve is 46 min I believe. The breakdown is 36+10+2, so you can use 5 starters and several different backups and reserves. I am not sure just to what extent you can use the same player as a reserve and backup and not suffer minutes loss, but at least backup+backup and backup+reserve seams to work fine (20 and 12 min respectively).