10 hours isnt that quick.
I have had full correction using a pro polish (nothing fancy) on a rotary on a Peugeot 206 in under four hours.
The Merc AMG I did a while ago took about 9 hours to get full correction on the paint.
Just depends on the car and whether its paint is willing to work with you. At the same time.
The last BMW I did took over 14 hours to get full correction.
Mike