Talk:Circlet Demon/@comment-124.6.136.138-20180612062149/@comment-45.56.46.26-20180612183523

That's the cooldown, but we don't know the persistance. It should generally be less than the cooldown for balance reasons. But we also know that some summons can become permanent or vastly extended in the New World.

Alternatively, a summoned demon can just be resummoned each time the cooldown/persistance runs out.

Mercenary summons seem to be their own thing. I doubt that the Circlet demon is custom NPC or POP from Nazarick, mercenary summon seems the most likely to me.