Depends on the speed of your system and the level of defragmentation on the drive. I presume it is heavily defragmented and there is a lot of data to reorganize. i would get a hold of Diskeeper 9.0 Pro!! It will speed up your HD!!!
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.