Eastern State was just so amazing to wander through and shoot. Everywhere you looked was another play of light and texture that was just mind blowing. I could have spent several more hours there, and easily shot thousands of images. However, if you are not hauling a camera, or trying to absorb psychic energy, then I can imagine that a couple of hours is probably enough. Actually, if you are at all sensitive to psychic energy, then I imagine a couple of hours is more than enough.