Thomas Shey
Legend
The base game tends to go longer because the characters are more enmeshed in the setting, so yeah about 3-6. It depends on how many npc’s you have and how quickly and dramatically the various relationships can change.
I tend to play the overwhelming majority of games in this way though. I’m extremely reluctant to make up any new NPC’s in Apocalypse World after the second session, ditto for Monsterhearts. If I do have to make up NPC’s, then I’ll only ever draw them from an established group and I make them purposefully bland unless there’s an already established (compelling) reason not to do so.
That's a bit odd for Monsterhearts given the media its based on have new NPCs show up all the time.