auth-source-cache-expiry

auth-source-cache-expiry is a variable defined in `auth-source.el'.
Its value is

7200

Documentation:
How many seconds passwords are cached, or nil to disable
expiring. Overrides `password-cache-expiry' through a
let-binding.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.