The WUs seem to be massive. Its saying about 10 days to complete
The ones I've picked up are going to complete in less than 4 days, this is on a 2700K, are you running 4 WUs and do you have HT enabled? I did notice that with HT on it was only using 50% CPU despite the client saying it was using 1-2 cores for one WU, 3-4 cores for another ..etc, so I turned it off, and it's now maxed out, I did try running 2 instances but it just seem to take twice as long, maybe there's a slight percentage advantage but I couldn't see it.