A password that contains 6  letters case, the hacker only takes 10 minutes to time out when they needed to take more than 44,000 years with the password contain 9 letters including  number, symbols, upper case and lower case.

Journal of Business Week (USA) statistical time needed to break a password, to help people use self-calculation to see how long it takes for hackers can penetrate into account e-mail, the service of their chat .