I find it very bad that something that only their for a short time. can only be played once to the end. After all any other Dungeon. can be replayed. I would love to see thing like this. were you can go have a break form the thing you are doing in other world of the spiral.
I'm hoping that this quest will be like the Lost Pages event. In that event, it was present for a limited time, and spanned many worlds. Occasionally, that quest has returned. Players who were not high enough level to complete all of it were able to access more worlds and do more of the quest the next time it returned. I think the reason they do these events is to give players a break and have something special available. The limited time keeps it from being just another farming spot.