It took me about 55 hours on normal with the true ending.
150 to platinum and that was because I had to play through it three times after missing a time sensitive Social Link.
It is not a hard game, and much more a sim game with JRPG elements. You will be hearing the characters talk a looooot. --- Xbox & PS3 gametag = StrikeNinja24 And if Strike didn't stroke his own peen, then nobody would. - Super-Pangolin