Well, I have never driven mine for more than 3-4 hours at a time. The roads in Virginia are TERRIBLE, especially in the area between Newport News and Va Beach. I can deal with the car, but I'm ready to get out after a 45 minute drive down I-64 to Va Beach. The expansion Joints literally look like speed bumps and stick a good 3-5 inches over the road surface. The car will literally JUMP off the pavement over these things, I wonder and dream of smooth roads....