Well making the long haul to Disney from NY I stopped at 10 hours. For me personally driving a TT which is different that driving a 5vr or MH, 10 hours was the end the range, depending on traffick. Sitting in traffick jambs kills my miles on the road. An hour or so, no biggie, but sometimes slogging it out on I95 can be exhausting. The longest I drove and will never do it again is 14 hours to MB from home. I was just toast when we pulled in. Not fun or safe for anyone. By the way this was a newbie trip. Now we limit it to around 8 hours. After all its the journey as well as the destination. If you dont get there saftely then what is the point. To many times I see some idiot flying down the road, swaying all over, passing everyone, TV stuffed with people. I have also seen flipped and burning TT and TVs and its a horrible sight.