Duration of kingdom penalties?

[Elodie Hiras]

Hello all!

Well, several things can cause penalties to kingdom attributes, such as losing armies and negative events. But I can't seem to be able to find how long would these penalties last...

If they don't fade away, kingdoms will statistically irrevocably erode over time. So how long are they supposed to last?

Thanks in advance!

[Diego Rossi]

By building memorials to the fallen heroes (monuments) and other kingdom actions.
Some event can give permanent bonuses too.