And so we veer off-topic...(I know, I helped...)
No, of course the rate would be different. But I'd still figure the cost of the shoot, celebrity, 3D work, etc., and give them a price for the whole spot, period. Not to sound high-falutin', but if you commission a painting from Picasso, you don't pay him based on how many hours he says it will take him to do the painting! You pay him a flat amount based on the demonstrable quality of his accumulated body of work thus far. It's a perfectly legitimate way of establishing pricing; I know several animation houses that price this way. What business is it of the client's how long it's going to take you?
I've nothing more to say on that point, but if anyone else feels comfortable mentioning a per second or per minute rate for typical "car commercial" motion graphics, it would be greatly appreciated.
Thanks!