Dunno if alredy happened to someone here but if you get a nice party in dungeon and you are strong enought to clear the first 2 spot in less then 10min well then u are bugged and u cant go spot 3... u have to wait the "20mins" for auto-open the spot 3.
So my advice for who dont know is better wait the 40min(countdown) before clear the spot 2 otherwise u need wait the 30min(countdown) for go to spot 3... just keep 1 monster alive (in s2) and kill it after the first 10min.
hope it help
cya
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