Did this while my pizza cooked, it was frozen so according to the box that's 18mins...needless to say there's shortcuts all over the place!
Annoyingly I left the cam locked on the car when I un-paused so I didn't get a 'clear track' shot for the background and had to cut round the cars (within the pizza time of course!)
Had it not been the week after the the Head-to-Head Photomode comp I'd have done a proper job of it