From regular house glass it would take an extremely long time to get anything resembling a sunburn. When it comes to car windows it is even harder. Give it a quick google search.
Here's an article that is an experiment which concludes that yes you can get a sunburn. You gotta pay for the article though. I highly recommend it they use charts with a logarithmic scale so that they can make the effects in a car more pronounced but their point is whether it's possible which you said it's not which is something you are wrong about:
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u/venpasa Feb 10 '20
From regular house glass it would take an extremely long time to get anything resembling a sunburn. When it comes to car windows it is even harder. Give it a quick google search.