I do 100% of the driving. My wife feels it's too big for her to drive. I used to drive tractor trailer rigs, so this is really easy.
I generally stop every couple of hours for potty breaks and stretch breaks. We have a dog, and she needs to go every once in a while. Plus, like someone else said, it's safer that way. I don't want to find myself driving so long that I get highway hypnosis. On long stretches with little traffic, it's a real thing.