My 100B run completed yesterday as far as calculation is concerned. It has spent all day today and half of yesterday converting the result to decimal, I imagine. 81.879 hours. I'll post a screen shot once it is 100% complete.

On another note, I have a question for you, Poke: I've noticed that the program has done 45 trillion bytes worth of reads so far. The unrecoverable read error rate for these enterprise-class drives is one per quadrillion bits read. This run has caused about 1/3 of that amount of reads so far and would have simply spun the dial around on regular desktop drives (1 per 100 trillion). Granted, in my case these reads were spread out among 16 individual hard drives. Statistically, I think that increases the expected rate, doesn't it? What happens if an unrecoverable read error is experienced? Does the system just try again and it works, does the calculation get a silent error in it, does it outright crash, etc? With these big runs, this is surely to be encountered from time to time.