In case someone is worried about this 180 day rule, I asked a person (who happens to be a friend of a friend) who holds a higher-level post at the migration office recently & he said he hasn't even heard of it & said why would the government want to damage the economy by restricting tourists re-entering. Makes sense & I've never had a problem re-entering a few days after leaving which I've dones so many times, I can't even remember exactly how many.