From Watertown
Hello 2much2do,
We know Watertown, NY. Very often, we stop there to fill up the gas tank, either when we live or when we come back.
Usually we do Montreal-Watertown in about 3 hours, Montreal-Syracuse in about 4 hours and a few minutes. So if I calculate well, it leaves us 20 hours to do the rest.
We take I-81 up to I-66 in Virginia then switch on the US17 (if I'm not mistaken) there down to I-95 in Fredericksburg. Doing that makes us save a good hour even though US17 isn't an Interstate highway.
We arrive usually at the Welcome Center of North Carolina around 12 hours after we left Montreal so that would be about 8.5 to 9 hours after you leave Watertown.
If you plan to do it in one straight shot, then these are the toughest hours to drive. We alternate drivers at about each 4 hours, or sometimes we went by gas tank, so we would stop for gas and to relax at the same time, making the most value of our stops and "wasting" less time. It also implies that we go at the restroom at the same time hahahaha!
7 more hours after the Welcome Center in NC would conduct us down to Savannah, GA or more exactly at the Welcome Center of Georgia. When we arrive there, we know that what we have left is about 5 hours. 2 and a half to Jacksonville and 2 and a half up to WDW.
The key to do it fast is not to stop too often and to rest or sleep in the vehicle when you don't drive. The stops need to be useful you go to the restrooms, you get food or drink, you fill the gas tank all at once.
All of that also includes a stop somewhere in South Carolina for breakfast where we easily stop for an hour or more to relax and eat.
As for the coffee, I discovered that for myself I have to avoid it. Drinking one at breakfast is OK, but then at night it boosts me for a few hours but then does do the inverse effect, I start to get more and more tired. I read in a book that contrary to what people think, coffee is not the best thing to keep you awake... Amazing but true for me.
So all in all you can do it in about 20 hours, if it's doesn't rain too much, if you stop "intelligently" and if you drive not too fast not too slow. My cruising speed is about 75 mph. Don't forget that in the Southern states they allow higher speed limits.
From Watertown to about Richmond Va, you go through a lot of hills and mountains, after that the landscape is quite flat. Also gas is less expensive in the Southern states. So fill up when you come back.
One small note about the come back. Never ever do we do it in less than 24 hours like if there's no adrenaline's rush to make us come back to work hahaha! It's always very much longer. Sometimes we were obliged to rent an hotel room because we were too tired to do it straight, because oh yes.... the most important factor is not to drive beyond your limits.... after all you're on vacations.
Hope it clears a few of your questions.... Have a safe and "disney" trip!!!
Bongo