if you know what you're doing..
it will probably take you around 2 hours for the hardware portion of the assembly.. and the software portion will probably take you 2 - 3 hours... format HD, install OS, install drivers (download latest ones..) install anti virus, and programs you use like msn, firefox, winamp.. etc
"Is virtue a thing remote? I wish to be virtuous, and lo! Virtue is at hand." -Confucius