National Focus=Assimilation?

[Darkrenown]

Yup there is a province decision that reduces the mtth for cultural assimilation, it has quite harsh requirements so its not something you can or would spam.

No, settlement policy is a seperate event with a 50 year MttH. Your focus does half the HttM for the cultural assimilation event though.

 

[Darkrenown]

What you're doing is fine. There are now two events that can change culture, cultural assimilation and settlement policy. Settlement policy you just enact and leave it, nothing else affects it and its MttH is 50 years. Cultural assimilation, a bunch of stuff affects it, its base MttH is 250 years and your focus halfs it.