Player spells or abilities that cause conditions always have a duration or cure style attached - poison and disease have their own rules, or casting Befuddle to cause the target to be clumsy & stupefied lasts for only the duration of the spell (1 round). But when the abilities are on a creature these aren't so obvious. When a Sand Wolf using its Susurrating Song, for example, a target is stupefied for 1-2 rounds and slowed 1 on a critical failure... but for how long? A Critical success makes the target immune for 24 hours - should we infer that the other conditions also persist that long?
I know that many of the conditions will have resolutions hidden elsewhere - Wounded only goes away with Treat wounds or being healed up to full (presumably by magic/alchemy/rest), Sickened requires spending rounds retching, persistent damage has a flat check component, and the Restoration Spell covers some conditions, but not all. But when/how do conditions without an duration or cure condition listed end?