Someone's auctioning a PAL copy of Tales of Vesperia for Xbox 360, for the starting price of £40.
Let's just say I've put a bid in for £55...and I'm winning. I'M GONNA WIN IT...OR ELSE!
My first playthrough was about 100 hours. I took my merry time and did as many sidequests as I could, crafted as many items I could, learned the skills, artes, altered artes, and secret artes, tried to get all the skits, and unlocked as many costumes as possible. I would imagine you could do it in about 40-50 hours without the all the extras I did.