I've owned a few antique cars for 20+ years. But when it comes to daily transportation, the longest was a 2000 Intrepid, bought on 11/6/99 and totaled in a parking lot hit and run on 11/18/09. So, it lasted 10 years and a couple weeks, and had about 150,000 miles on it.
Second runner up was a 1968 Dodge Dart 270 hardtop coupe I bought in April of 1992. It had about 253,000 miles on it, but had a rebuilt 318 V-8 put in at 242,000, and a replacement transmission and rear end soon after. I took it off the road to do some body work and get it repainted for a few months in 1993. Sometime in late 1995 it hit 300,000 miles. In 1997 I got a newer car, which was replaced by another, and then the Intrepid, so the Dart got driven less and less. One morning in late 2001, with about 338,000 miles on it, it refused to start. It was just something minor like the fuel pump, but I didn't have the time or money to mess with it, so I just let it sit. It was looking pretty ratty by that time too, as it had suffered a few minor hits here and there, and some rust was coming through the rear quarter panels really badly. In 2009 I finally got around to selling it.