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I would somewhat worry about the interior if you are super anal. If the interior of your car is hitting 120+ degrees, all of the plastics and glues will be expanding and contracting. Things that were tight might suddenly be loose. Although the build quality of these cars being what they are, I'm not sure that it matters - nothing is screwed together all that well.
As for the exterior, I can't find the article right now but it talked about how paints are developed and tested against the sun so the paint doesn't fade. If I recall correctly, this company has car panels that sit out in the sun for decades to show that modern paints are not affected by UV rays or heat enough that you would notice.
What gets people is pollutants embedded in the clearcoat and oxidation making the paint look hazy or discolored. So it's the clearcoat that is the issue, not the paint.
A good buff and polish usually fixes that right up. If you have taken care of your paint, a few weeks isn't going to hurt anything. If you have a layer of wax, then a normal wash should clean it up just fine.
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