I have win7 x64 on a i7 860.
The first time I downloaded BRP3 cuda 32 WU, the Boinc client indicates a previous crunch time of 3 hours ; 29 minutes and 51 seconds. I crunched my fist WU # 29520 in 4379.80 sec run time, 1328.99 CPU time.
About BRP3 SSE, the boinc clients indicates a previous crunch time of 71 hours ; 20 minutes and 41 seconds. I guess it will take around 20 hours to complete in real.
I don't know if there is a way to gives a previous time more real. Some people who download Albert's WU for the first time could be afraid by reading a theorical previous time of 71 hours in 15 days.