The Wii or DS version? They're pretty different. I don't really know anything about the DS version, but a let's play of the Wii version runs at 8 hours from end-of-customization to credits. That's a let's play, though. I'd have to do some routing/research to figure out how long a more optimized run would be. It would probably run you over an hour, at least. Maybe a few hours.