3 of us rode 1040 miles last week in 19 hrs 6 minutes. Stop every 1.5 hrs or 125 or so miles for fill up. We stopped twice for SubWay and rode on average 5 over the speed limit.
It takes me about 10 hours to do 500 miles. That's about all my azz lets me do in one day. Knee's and legs can be repositioned but theres only so much movement on the seat.
The farther I go ... the more often I stop. \\; I find that it's harder for me to maintain my focus later in the day, so I try and stop more often. \\; My first stop of the day may be 150-160 miles, but by the end of the day I may only do 60-70 miles before making a pit stop. \\; 750 miles is a long day ... well done and ride safe.
I think Highway pegs make a huge improvement in comfort. You may want to consider a cup holder if you plan on long distance rides.
Hydration is the key and very important as we are in the sun all day. I have an insulated tank bag made for a hydration pack among other things. It works well for me since I wear a full face.
Gas stops are usually good enough for me solo.With the wife?LOL,every 100 miles at the most.Plus long sit down eats as well.Of course running in 100 deg sun I'm in for 100 mile ice cold bar stops.Just 1 bottle though.