I did mine from Jacksonville, FL to Wilmington, NC and return. Had plenty of time; I stopped to talk firearms with a gun dealer and when I had electrical issues in a mild rain stopped for coffee (no jokes please) at an old truck stop brothel that I knew of that had lights and a canopy to keep the rain off while I checked out the bike's electrics.
Build up to your SS1K. Do a 500 mile ride. Then a 700 mile ride.
The man that said that a minor irritation becomes a major irritation was 100% correct. Eliminate the minor irritations.
Different things work for different people. GPS (to follow my progress) and timers help motivate me.
Get organized. And prepare.
IBA #7552 - SS1K in 2000 and 50CC in 2002
In the Uvalde, TX area and always willing to help travelers escaping into Mexico.