It really isn't too bad. I'm in no way "good" at Resident Evil games. I played the original two games on the Playstation and am part way through 5 on the 360.
You can get half way in two hours, and as you can save you can turn off or do whatever. My total time was a touch over 4 hours in the end, but I had to reload the save once as I died in a random place when I got bumrushed by standard zombies and had less health than I thought.
Currently Working on: TY The Tasmanian Tiger (W8)