Uh oh, hope it doesn't give me a problem.. I too have 8 gigs of RAM.
Also, on average, how long does it take for your cpu to get from one step to the next? It takes my computer about 15-25 minutes per step (Which I actually thought was slow.. but I'm not sure now.) My other machine takes more than twice as long per step.
Time per frame varies greatly with different Work Units. It won't mean a whole lot without knowing what unit you're currently working on.