I don't know how long a UD unit takes, but my average seti unit on my Tbird at 1ghz with 133 mhz fsb and SDR ram is about 6.5 hours. SETI Spy says that there's anywhere from 3.7 to 4.0 TeraFlops of info to process in each unit...
If my baby don't love me, I know, I know, her sister will.