title: Emacs GPG passphrase timeout
body: <p>How can I set up Emacs to re-request a passphrase when saving a <code>*.gpg</code> file only after a certain number of minutes have passed? While I know I can set Emacs up to request the passphrase only when opening, I would prefer a system where the last passphrase entry "times out" after, say, 5 minutes. I thought I saw something about this in the documentation before but seem unable to find it again and a web search turned up with nothing.</p>