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Vampire rules regarding sunlight.
Daywalker feat from Vampire archetype.
As far as I can tell, as-written the Slowed condition would continue to increase - it just wouldn't destroy the character when they lose all of their actions.
I'm not entirely sure if that is playable though. If it becomes too much of a problem, it may be good to houserule it to allow one limited action per round to use on Stride or Crawl to get out of the sun under your own power.