Sometimes I wonder about the password managed on our internet sites, the other question is how they are safe these passwords? The answer could be in the article "How quickly can your password be cracked? " by Mike Halsey. There is a good answer about how long it would take an average PC to crack different types and lengths of password. Follows the chart with password lenght and the estimanted time : The main concept explained in the article is " The easiest passwords to crack are those that are simple words. If your password is your date of birth, dog’s name, child or favourite place then I’d suggest changing them for a stronger password today." Source : "How quickly can your password be cracked? " by Mike Halsey.