Got pretty far in Last Story on my day off yesterday and this evening. If I wasn't playing in 2 hour timeslots during the week, I'd probably finish it tomorrow. But as is will probably have it done by the end of the week.
Looks like the game is about 20 hours for the main story with about 5-10 hours of optional stuff. I'm ~13 hours now and 80-90% done. Game is short because the story is short/small-scope and the world is tiny (1 town/island), but also because it's paced like an action game ala, ME2/Gears where you run run run and fight while you're doing it and watch cutscenes. It feels like you're playing a Michael Bay movie (and the story is just as dumb).
Definitely doesn't seem like the rpg-savior ff-killer that nfans want it to be. But it seems like a solid experimental rpg. Like RoF but a step below. But Wii still has Xenoblade so nfans can hold that up high (assuming it ever comes out in English).
I really hope Sakaguchi doesn't retire though. The genre is starved enough, and anyone trying to innovate is needed in the industry right now. Plus you can't discount that Sakaguchi charm
