It takes an average of 5 seconds to crack an easy password on a Windows machine; considerably longer on BSD or Linux.
Always use a strong password. A strong password is a password with many letters and numbers. A good password never has a name of a friend or a pet.
No password is uncrackable.
Here is a list of the top worst passwords that people use:
Never use those passwords!
Best use mixed-character passwords of eight characters or more and use different passwords for different services.
Good passwords look like this:
If you’re a little stuck trying to figure out how secure your password is, Microsoft has this handy tool available for free.