hmmm..I didn´t time my playthrough 100%.. but I think I used 8-9 hours (but I also collected some stuff and fooled around) for my first playthrough.Used 20-30 hours to 100% the game. I could probably run through the game in around 2-3 hours now, if I skip everything and never stop.
The thing is (for me at least), the length of the game feels just right. No filler stuff or drawn out missions.. just pure gaming bliss.. BUY IT GUYS: ;o)
Too bad the Vita is too hard to record and the install base is too small, it seems like Tearaway would be a great speedrunning game.