This all depends on the vehicle, the way to look at it is that the car tells the chargepoint the rating it can pull. Example if you have a MG which only pulls 7kw to the battery and connect to a 22kw charger it will only still pull 7kw. A Tesla from 0% on a 11kw usually take 3-4 hours for a full charge. The larger the battery capacity, the longer it will take to char