24,000 miles/40K kilometers on my Honda. Planning to keep it until it stops working, or I move to somewhere that I don't need a car. Or possibly until electric cars are a good option. Aside from the not needing a car possibility, I ought to have it for a long time.
My family tends to keep cars a long time. My uncle just traded his Honda in at 240,000 miles, and still running, but with increasing maintenance, whereas my dad drove his Mazda until over 190,000, before giving it to my sister, and it now has 200,000. I learned to drive mostly in that car, and it's great - small turning radius, great visibility inside, and 40+ MPG on the highway on gasoline. Meanwhile, my mom's car has less mileage, but is older than I am.