So, which game did I finish? Final Fantasy Fables: Chocobo's Dungeon.
It took me just over 32 hours, by the way. About 30 minutes of that time was spent watching the title's painfully boring closing credit roll. I sat through it, though, because I knew a number of post-game dungeons would open up afterward.
After I conquer those dungeons, I think I'll tackle another Final Fantasy spin-off that I started (but never completed) long ago--Final Fantasy IV: The After Years.