Two hours!?! I'd hardly call that a "complex" scene, in fact with only one figure in it I'd call it simple. Is that the original render size? Because if it was, you are either using some terribly wasteful settings, or P7 sucks.

By way of comparison, here is a recent Poser <- 6 -> render of mine that has similar elements; a woman, a car, a dress, and a very high res 360 degree photo applied to a sphere to form the background. My PC has only 1 Gig of RAM and is 5 years old. This render took less than 10 minutes.

What the heck were your settings?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)