after reading all the speed runs I almost forgot what this thread was about.
Sure the game might be 12-15 hours but that is probably for a good skilled gamer. Most average gamers and people that like to enjoy their games will take longer.
Like RE4 when I played it first time I spent a lot of time just running around areas exploring for hidden things (ie boxes and barrels). I think i racked up about 16hours in RE4 just by exploring lol.