A recent (8 days ago) comment on the hexandcounter subreddit post announcing that game says they're still playing, though it's not confirmed by Jake himself.
(Personally, I don't find any of the - very few - claims to have played a full game solitaire to be plausible, and I'm not aware of anyone even claiming to have played a full multiplayer one.)
It is participating in an art piece that was created with painstaking attention to detail. One of the games I have is a WWII submarine simulator ( https://boardgamegeek.com/boardgame/17484/silent-war ). While play testing it, the realized that the US fleet was sinking too much tonnage. After going back over the records they realized that at any time, some portion of the fleet wasn't out in the ocean but rather in dock getting refitted. Adding that to the rules brought the tonnage sunk back within historical lines.
They could have changed the victory conditions to match the values that aren't in agreement with history - but they didn't. This is part of the (for lack of a better genera description) American Simulationist genera where the goal is to model the thing as closely as possible with rules and cardboard.
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I've played some two day games. Games where you spend an entire weekend playing one game. With the right group of people, it's quite fun. And then the next weekend, we play another game.
I've also done PB(E)M games where the game can last as long as the person running it keeps it going. ( http://rickloomispbm.com ).
This, to me, isn't any different than someone who is still playing an MMO - just a different medium of play.
Eh, not really. It's an art piece for sure, but as much dada as simulationist. As Berg said, it was designed as "a wretched excess." I think Jake's CNA game is less the gearhead obsession in so many of the WW2 simulations and more like the attitude described at https://boardgamegeek.com/thread/940888/
“Well, Troy,” I went on, “I want to be the guy who suddenly, at age 42, does spend hours doing this kind of thing, if only to feel what it’s like to take back a little piece of the soul I’ve sold to the company I slave for, to the obligatory evenings with people I’m not sure I even like, to daily errands, the lines at the DMV, to tax forms, to tedious family visits. This game is a slap in the face to all thinking creatures who live in such dire fear of the sands sifting through the hourglass. Playing a monster war game on this scale is ridiculous, a waste of energy, a waste of time, and so I want to do it. Let spite rule the day, Troy. Let’s learn and play A World at War!”