In 1930, Charles Creighton & James Hargis drove from New York to Los Angeles and back entirely in reverse gear, and without stopping the engine once. How many days did it take?

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NY to LA is about 2800 miles or 5600 return. If they could average 10 mph including fuel and bodily needs stops, it would take them 560 hours or 24 days of driving 24 hours per day; alternatively 48 days if they only drove 12 hours/day. Looking at the picture it seems they damaged a mudguard at some point so steering may not have been very easy.

That’s some pretty good math. It turns out it took 42 days.