I've got about six and a half hours invested in this game, according to its timer. That makes the actual figure at least an hour higher, when you consider failure + restart from last save. I just got through Yoshi Island and now I'm in Yoob's Belly (that's what, halfway through?).
As a lover of Super Mario RPG (SNES) and Paper Mario (N64/GC), I am riveted.
I'm nowhere near this far on Zelda: Twilight Princess (Wii). I recently got through the Goron Mines. I know, pathetic.
Happy Saturday.
-Chris