My dad had a 1966 Ford Galaxie 500 7-Litre with the Police Package. Man, I’d love to have that car! Not that I could drive it much. From the day he bought it until the day he sold it it got 8 mpg and used a quart of oil every thousand miles.
Of currently produced cars, the only one I can think of that exceeds that length is the Maybach 62, which is around 6.2 meters or 20’ 8". Of course, it’s so low volume it barely qualifies as a production car.
now i want one