@Jockette, believe it or not, I didn't stop much. The first day, I drove 3 hours and stopped for a little less than an hour for lunch. Then I drove an hour, stopped at a grocery store to walk around and get a snack(10 minutes) and then drove the rest of the way, about 4.5 hours, without stopping again. The second day, I drove 3 hours, stopped for lunch (1 hour), drove another 2 hours, stopped for gas(10 minutes), and finished the trip with a final hour and a half.
The top keys for me were sitting as high as I could raise the seat in the SUV, so it was more like sitting in a chair; using cruise control so I could move my legs around frequently; and the long lunch hours, which allowed me to work all the kinks out.
I didn't have to ice or elevate either night. We'll see if I can repeat the process to go home! (Thursday and Friday driving). I just found out we're flying to Denver on Sunday for DH's entomology/extension meetings. He's receiving a national award so wanted me to go, too. Other than the award session, I'll probably be wandering around, or maybe even painting(!) while he's in his meetings. I thought the trip was several weeks away, and although we'd talked at one time about me going too, I hadn't heard anything about it so thought he'd changed his mind. Guess I'll find out next what works for me in air travel! Stay tuned for the full report. WE're going Sunday and flying back Wednesday, I think