Wouldn't a CPA of that size mostly fail to materialize? CPAs don't spawn new ships if there's not enough in the galaxy, right?
Nowadays between the barracks and the strategic reserve and the normal guards there would be quite a few total ships available for CPA duty (if you want to see just how many, I think the "pull the lever" cheat should unleash them all), but yea, a million+ CPA would largely just not show up.
You can see the amount of AI ships in "Stats" --> "Galaxy Stats":
"Your Ships: 3029"
"Allied Ships: 39"
"Enemy Ships: 7439"
Since I have that many "ships" I assume "ships" also means turrets and buildings? Also I checked those numbers at the start of the game and "Enemy Ships" was something like 10k or 12k. I guess destroying Barracks lowered that number.
Since "Enemy Ships" = 7439 does this mean max CPA size would be a bit less than 7439 ships? I mean AI never sends ALL ships. Right?
EDIT: I set Filter to "My Units" and calculated the amount of units and I got 3029. So that number does include ships, buildings and everything. That makes me wonder how many SHIPS the AI really has.. cause the AI has 72 planets (I have 7). So there's a LOT of guard posts, Hybrid Facilites and other buildings. There's literally 3 Barracks left in the galaxy.