Well, that's it.
Some autobiography:
I first read War and Peace in college, where it was one of several novels assigned for a Classics of Russian Literature course. The professor gave us a month, a pretty generous amount of time, to read it. I was on track through the end of Book I, then stopped and skipped class for a few weeks. With three days left to write the paper, I shut myself in Michigan's grad library for an evening and read the bulk of the novel, 800 pages or so. It was the highlight amongst many of a certain kind of reading I used to be able to do: read a lot, quickly, in a short amount of time, with high comprehension and retention. It's not surprising I went on to grad school.
In the intervening 20 years, I have learned a few other ways of reading. I could not repeat that effort now for a variety of reasons. Instead, it was smooth background reading that didn't require much effort, just time. That's how pretty much everything is now for me as a reader, that's what we train a lifetime for.
More substantively:
When I read War and Peace before, it was the only Tolstoy I had read, and I didn't like it very much, largely because it was not Dostoevsky. (Or, as I learned in that class, Gogol or Turgenev.) Beginning in 2015, I made my way through most of the major Tolstoy works--Anna Karenina*, Hadji Murat, The Cossacks, The Death of Ivan Ilych, The Kreutzer Sonata, etc. Re-reading War and Peace was meant to be an attempt to set his biggest work in the context of everything else.
It's not an original thought that Tolstoy is a novelist best in small moments: the rose at the beginning of Hadji Murat, Kitty and Levin writing to each other in the dust of the table in Anna Karenina, any of Prince Andrei's moments of realization in War and Peace. And this is the place it's easiest to like him best: life hinges on small moments and decisions and it's hard to render their impact in just the right way, but Tolstoy never fails at this. Following Isaiah Berlin, Tolstoy wants to be a novelist of big ideas, and the attempt to do this is where his novels fail.**
But living now in some let's say adventurous times, there's something about the sweep of War and Peace that feels true to life in a way it didn't to a 20-year old in 2001. It's in how regular, everyday life gets overtaken by events til it feels like there is nothing but what is burning in the world around you and then, just as suddenly, it's gone and you move on.*** Living through 2020 as an adult and a parent was enough to see the world alter and then forget; it's not the only time life has been like that. So the novel ends with everyone who survived more or less happily paired off and the next crisis already on the horizon. It's not a novel that finishes, it's one that stops, and there's nothing truer to life on the grandest stage than that.
* I read only two novels the year my first child was born, but those two novels were Anna Karenina and The Portrait of a Lady
** Zola, the novelist of French life and character: excellent. Zola, the novelist of big ideas about human psychology: terrible.
*** This is part of what goes on with A Dance to the Music of Time: while I prefer novels 4-6, it's hard not to argue that the emotional high point is not the WWII novels. There's nothing that can match the emotional intensity of Nick Jenkins accidentally finding himself at the victory service at St. Paul's, and nothing does. But he keeps on writing anyway. What else is there to do?