How far have you gone in a car? From where to where? Are you in the US or elsewhere? Longest for me was Detroit to Dallas and back, and, New Jersey to Miami Florida multiple times. Both trips are 1200 miles or 1900km each way.
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I live in Switzerland. My longest car trip as in "one ride" (with only short, 10-minute breaks in between) was when I was about 13-14. I travelled with my whole family from Zurich, where I live, to Amsterdam (Netherlands), where my aunt comes from. On the map it doesn't seem too far but it still is because you have to cross all the way through Germany. It took about 12 hours and I just remember that my siblings and I were reeeeeally glad when we could finally see the estuary where the Rhine flows into the North Sea.
The longest car trip I ever took as in "several trips added up to one big trip" was 4 years ago, when I went on a road trip with my best girl friend from New York, all the way down to New Orleans, then across to Texas, New Mexico, Utah, Nevada, Arizona and up into California until San Francisco. I don't even know for how many hours or kilometres we were sitting in that car but it was a loooot. But it was okay because we also took 5 weeks to do this, so we always had a couple of days to stop somewhere and have a look.1