Leaving the car in the sun for too long?

It all depends on what type of car you're driving, is it a recent model? or did you just have a paint job on it?, or how well have you taken care of the exterior of the car? if the paint on your car if fairly to good, two months it's not that long, especially that the weather is changing, but if the paint is from not that good to poor, I'd put a few coats of wax on it first, actually, I'd do it either way, just to make sure, good luck!!