I don't care what software you have, If you give me a .rar file with a password of 15 characters or more I wouldn't even bother to attempt to crack it............ I would be looking at months if not years; and that is on my Phenom II x6 3.2~3.8GHz with 8GB of DDR3/1333MHz and SATA2 drives.
I believe that .zip files are somewhat simpler, but I have no idea by how much... (