my max so far is about 600 years, as I must admit it can get a little boring. Also, the armies tab seems a bit confusing and I recommend explaining how it works.
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The Armies tab was mainly for debugging and I'm still not sure if it is necessary for players to see, basically it shows the entities that do the attacking and defending the border and seeing them might explain why some nation is losing a war. As for your ideology comment, I'll think about it :D for example how it would effect the nation's behaviour. Again, thanks for the feedback!