Technically it should be possible to get to 80-90% at full charging power, assuming the car/battery and charger are properly designed (read: cooled) - most are not, so the charging quickly slows down to prevent overheating.
After that lithium charging (should) transition from Constant Current to Constant Voltage charging, which slowly tapers down to zero, and it usually takes forever to finish.
Does it necessarily charge at that rate the whole time though? It slows down as it fills up I believe.
It would not charge at the full speed the whole time, but the specifics depend on the individual model of car.
Technically it should be possible to get to 80-90% at full charging power, assuming the car/battery and charger are properly designed (read: cooled) - most are not, so the charging quickly slows down to prevent overheating.
After that lithium charging (should) transition from Constant Current to Constant Voltage charging, which slowly tapers down to zero, and it usually takes forever to finish.