SETI@Home it was called.
I used to do that as well. I'm pretty sure computers now could sort that data in 1/100 of the time it took my desktop back in 1998.
If I recall correctly, it took me on average 15 or 17 minutes to do one "block" of data. I remember how big a block was though.
Edit:
My memory must be bad because it took this guy 8.5 hours to get 94%, so maybe I was 15 hours. haha.