Well, a major factor is the web of interconnected relationships that allow human beings to function.
So there's gonna be a lot of SOCIAL LINKS SOCIAL LINKS SOCIAL LINKS-
Err, I mean, socializing.
There'd be a lot of alternating between reaching certain points in dungeons and returning to a base camp/stronghold/city and investigating things socially and with detective skills in stark contrast to the all out war that is the combat portion.
Naturally resting inside a Persona Dungeon isn't really possible, which helps with this.