It does not matter, is it fresh paint or is it factory paint- if its factory u have nothin to worry about, its not gonna fade all of the sudden, but if it is fresh paint, you never know what kind of products they used to clear the car, and what effects the "heat" not sunlight have on that particular product. It takes a LONG time for the clear coat we use at my shop to die back, and even then you can just sand and buff it again for perfect luster - you'll notice the die back more on a black car than anything else, and any dings by the way lol good luck
Paul Perreca