it should also be noted that these speeds are referring to system passwords, not embedded file passwords. so if you have let’s say an excel file with a built in password, that’s really easy to crack, even if it’s some long combination of numbers and letters (caps and non).
basically a password cracker will identify where the password exists in the hex by guessing it repeatedly. then based on the changes in the file’s md5 (or sha1) the cracker will get closer to the password until it finally hits it. so i wouldn’t advise using the same password for let’s say an office document as for a bank account. files with embedded passwords aren’t secure at all.