119 years in a turtle game (yes, I'm serious. I basically just ran this game while listening to and watching Let's Plays). Started with 1 billion, Conventional start, starting year 2000, no NPRs at the beginning but generation chance is at 30% (though so far no worlds have fit the criteria). Invaders off but Swarm and Precursors on. Maintenance off. Population sits at 9.2 billion total, and the top 3 most populated systems are: 7.5 billion in Sol (I made Luna, Titan, Ganymede, Io, and Europa habitable though database modding), 666 million in Laleagan/Wolf 359 one jump from Sol or 1.6 Bil Km, and 455 million in Trightion/Gliese 674 two jumps from Sol or 9.4 Bil Km.
Earth is the main shipyard/everything but installation production world in the system and indeed the entire empire, and has plenty of minerals to spare. Luna is the huge production center of my empire (4000 factories) for installations. Titan is a large mining colony. Every other planet/moon in the system is pretty much nothing but population. Sol also contains reasonable amounts of most minerals for a long, long time. Though unmined Tritanium is running very, very low.
Laleagan is fully self-sufficient. They have a large Venus-like planet named Aklain with TONS of all minerals in the game (abit at low accessibility), and TONS of certain minerals on the single populated planet named Agrain (also at low accessibility). They have factories and shipyards. If I were to lose Sol, I would be able to continue on.
Trightion has no industry yet. The cause is they are decently short of Tritanium, Boronide, Vendarite, Uridium, Corundium, and Gallicite in the system even though there are 3 populated planets, so any serious industry in the system would require getting those minerals from another system. However, there are two fuel harvesters orbiting a gas giant. The first ones ever in my empire, I must add.
Sirius, one jump from Sol, has only one planet: A small gas giant with roughly half the size and gravity of Jupiter. However, that gas giant has one habitable moon along with a bunch of inhabitable ones: The populated Mass Driver dump-off moon called Piclast, with an automatic mining moon named Cabria, which has good amounts of minerals for Earth, since Earth is slowly running out. Piclast has one thing going for it though, even if it kinda sucks: 1.9 million units of Mercassium at .9 accessibility.
I have another populated system, but there's no reason to mention it because it's a dead end and currently I have no plans to do anything with it. However, it ALSO could be self-sufficient if need be on closer inspection. So maybe it will become important in the future.
Military is pretty decent against Swarm, though I haven't tested them against Precursors just yet, and there's absolutely no anti-missile missile ships yet (I am lazy) so I'm not willing to try until then. Invaders... same thing, except I'm kinda scared of them. Though I probably shouldn't be, because my technology is extremely high.
...I think that's everything of note in my game.