my dad has a record for owning a car for exactly 36 minits it was a 1993 chevy lumina Z34 and ... sadly it did not make it home it burn up good news was we got are money back a big waping 1000$ so what the shortest time you've owned a car?

not me but:

http://www.driftworks.com/forum/923065-post2.html 

4 hours later, into a speed barrier. still drove straight, test drove it on a private straight, chuki dori all the way.

15 minutes... i traded cars and then someone offered me money right in the parking lot.