However, even when password cracking tools continue to improve, it still can take months to crack a strong password. Here is one of the best tip on creating strong secure passwords:
Instead of using the same password for everything you access, choose a root password, then take the name of the service or application you’re accessing, replace a few letters with numbers (or jumble it up), and append it to the end of your root password.
OfZenAndComputing.com has some more strong password tips:
1. Do not use names, nor words found in the dictionary.
2. Your password’s length should be at least 8 characters long.
3. Select an alphanumeric password, meaning that it contains both letters and numbers. Try appending a random number to the end of the password, or replacing one or two letters with numbers.
Source: Create a strong, secure password | Passwords: The weakest link