One of the benefits of the trip between here and my family being almost exactly five hundred miles (nearly to the mile!) is that I can chunk it into conceptual 50-mile, 10% increments.
In their book Mean Genes, Terry Burnham and Jay Phelan note that people rely heavily on trends and measurable progress. They use as an example of the latter case one author's profound mistake of having "Write Dissertation" on his daily to do list. The consequence of this misstep is having an incomplete task lurking on his list, day after day. Over time, this is a crushing thing. The alternate approach of breaking it down into achievable steps is much healthier. "Write draft of chapter one" might sit on the to do list for a short while, to be crossed out (done!) and replaced by "Revise draft of chapter one" and so forth.
Similarly, I've experimented over the years with different ways of chunking my trip along the length of California in psychologically useful ways. I've learned that I can't rely on physical landmarks -- I consistently misgauge where certain things are, and then my sense of progress is off, which can be discouraging. I initially tried looking at quarters -- that would be 125-mile increments -- but that's so long as to also be discouraging.
I finally settled on fifty-mile increments. Fifty miles goes fast enough that I'm not likely to find myself checking the trip odometer repeatedly, yet it's still a meaningful chunk of the trip -- 10%.
That, along with caffeine and sugar, maintains trip sanity.
I had Littlestar's bunnies as my traveling companions this time, as I took care of them with great help from my parents for the past two weeks. They were excellent travelers this time, taking a day-long car trip in stride, happily munching on hay and seagrass mats whenever we stopped for an extended break.