What are the National Cyber Security Centre guidelines on password Expiry?

What are the National Cyber Security Centre guidelines on password Expiry?

• Don't enforce password expiry
• 30 Days
• 90 Days
• 60 Days 

EXPLANATION

“Change your passwords regularly” is a common piece of password advice, but it isn't necessarily good advice. You shouldn't bother changing most passwords regularly — it encourages you to use weaker passwords and wastes your time. Yes, there are some situations where you'll want to regularly change your passwords.

 Therefore, for decades, many security guidelines have recommended frequent password changes, usually between 30 and 180 days.