I'm guessing you are talking about the black box charger that comes with the Traxxas rigs? If so then yes that is about right. The charger is designed to charge an 1100mAh (I think) battery in 90 minutes, so for a 3000 you would have to do it 3 times. Your best bet is to get a separate charger for your other battery packs and use the stock charger for the receiver pack on the rig.