I am selling my 3 year old MBP tomorrow. There a few sensitive documents like W2, Bank statements and Tax return documents on my drive. I do not want to take any chance and am planning to do a 7-pass Erase. Does anyone know how much time would a 7-pass Erase take? My MBP is 2.16 GHz Core 2 Duo machine with 1 GB of RAM and 120 GB HDD. I would greatly appreciate any quick response.