In a car specifically? Then the record for that would be about a day? From Singapore to Malaysia.
If आप include other vehicles like vans या buses...*shudders* the longest was nearly three days. A grand total of 56 hours. Luckily, that vehicle was an RV. Touring China's countryside in it was fun but I think I got motion sick halfway through the first day. I remember begging my mom to let me out of that thing द्वारा the end of the सेकंड day. I vowed never to ride one of those things again...