According to Businessweek based on the data collected by Gartner, Forrester, Duo Security, Impervaand LastBit Software, any 6 character password with only alphabets can be cracked in just 10 minutes while a 9 character password complete with letters, uppercase, numbers and symbols will take 44,530 years to crack. This is why some websites make it mandatory to accept only those passwords which contains both letters and numbers.

Check the image below to know how long will it take for hackers to crack your password
Time it takes a hacker’s computer to randomly guess your password:

Most-used passwords: 123456, password, 12345678, qwerty, abc123

Average amount it costs a business to field a phone call requesting a password reset: $10
Proportion of help desk calls that are password-related: 30%
Users who choose a common word or simple key combination for a password: 50%