Something close to 30 hours, a lot of pausing and doing other stuff, plus leaving the game on in an open area with no enemies to do something else caused that. I didn't really care too much how much time was wasted.
I thought I had something meaningful to put here but I'm at a loss so...booty-butt-cheeks. Oh and thanks to Gackt for the Signature. Because OP Man and Japanese Iron-Man are too beastly.