My old computer (400 MHz AMD K6
-2, 96 MB
RAM) used to do them around 90 hours apiece, while my current Dell laptop (1.6 GHz, 384 MB
RAM) did them in 15 hours. But lately it's gone up a lot, to almost 40 hours. I'm not sure why, though.
For example, right now my data unit is 46% done, and it has taken 23.5 hours to process it that far. Seems slow to me (although they did change the data units several months ago, to search for more stuff).