I guess everyone's experience is different based on what units they use. I beat conquest 19 in one go by giving Azura a beast slayer and having everyone pair with her in attack stance. I also played it very safely and spent 20+ turns.
I just found out that the AI in Birthright seems to be different from Conquest from my experience. Right now the enemies are smashing their heads against Rinkah doing no damage, whereas in Conquest they won't even try attacking Effie.
I just found out that the AI in Birthright seems to be different from Conquest from my experience. Right now the enemies are smashing their heads against Rinkah doing no damage, whereas in Conquest they won't even try attacking Effie.