Technically the only dimension travel in the game is planar sphere, or a few portals here and there.....I don't think the spelljammer have any specific purpose relating to the main quest. (I am not too sure, but this is what my past experience told me)
Also, I don't think it is possible to wander in drow city for more than a month, since the quests there are time specified/constrained. But before you ever enter into the drow city, I am sure you can wander in the general Underdark map for quite sometime.....but why?
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