An App Password is a 16-digit passcode that gives a less secure app or device permission to access your Google Account. App Passwords can only be used with accounts that have 2-Step Verification turned on.
How do I find my Google app password?
Go to your Google Account. On the left navigation panel, choose Security. On the 'Signing in to Google' panel, choose App passwords.
Does Google app password expire?
Google does not provide an inbuilt feature to implement this password expiration standard in G Suite account. Enterprises need to adopt a Google cloud security vendor, which features this policy within its software.