Using version 3 (and the command line version, not the graphical/screensaver version) takes me roughly 7 to 8 hours to complete (I think). Its hard to say because my average stats are high due to old versions, older slower computers, and the screensaver version.
When I switched to version 3, the screensaver took about 25 hours on my old pc. The command line version on that machine (under unix now, not windows) take about 8 hours. This new win machine is much quicker though.
In the 3 weeks ive been using these two machines in tandom, my average time has gone down from like 12:36 to 11:56 and still dropping with each completed unit.
--mark