As you can see, a nation conquered the entire world without my help and it took nearly 8000 years, (with revolts) and it appears once a nation conquers the entire map and have cored or neutralized a city they don't get anymore revolts as the revolt risk drops to o% and the game is pretty much over, (unless you manually revolt it).
Also I noticed in my game the largest aged nation which is also part of the first generation of nations (2569 years old) is linked to every nation that ever existed, meaning a long lasting start nation can manage to get every revolt connected to it. It was also sad to see it fall, it had a total of 29 revolts while the rest of the nations had maximum 19 revolts.
Great game btw.