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I know that CBs created via "Justify Wargoal" diplomatic option expire in a couple months, but do CBs created via National Foci expire too? And if so, how quickly?
Or if you are Japan, and start war with China and then goes for the South Expansion NF (where you can declare war to UK and Netherlands) it will last for 2 years OR you defeat China, then you have to justify war or wait for german-polish war for danzig and join Axis.