I agree with BB, couple hours is excessive for a simple scene.  Unless there is more to the scene we are not seeing.  Your background appears to belong to a scene set which means that you will have additional objects and props placed about.  If that is true, Poser will try to render everything regardless whether you see it in your camera view or not.  I would suggest you switch to your Auxiliary camera and identify every prop on the set.  Determine if the props are necessary to the scene and either delete them or make them invisible.  This is an inherent problem with Poser.  The more props and objects present and unseen adds to the render time.