Over 1,000,000 miles.
Seriously.
Cars DON'T HAVE an expiration date, or max amount of mileage.
People ask this crap all the time, and don't bother to think about it.
It's a machine. That's all. Maintain it, repair it, it will last indefinitely. Just like a house, or anything else that requires upkeep.
If it fails, it's because the owner failed the car, not the other way around.