Your car is actually charged
Your car is actually charged by current, not wattage or voltage. Physics: 3300 KW / 110V = 30 Amps max. Most household circuits are 15-20 Amps and that charges your car in 12 hours
Now 6600KW/110V is 60 Amps but your circuit can still handle only 15-20 Amps so the car will charge at the same rate. You will need 240V with a 50Amp circuit to charge faster.