title: Google Tag Manager - how can I fire a tag with a specific frequency (i.e. once every 30 days)?
body: <p>When implementing a Tag inside Google Tag Manager I don't see any option to fire a Tag only with a specific frequency.  For example,</p>
  
  <ul>
  <li>Fire Tag only once every 30 days</li>
  <li>Fire Tag only once per visitor</li>
  <li>Fire Tag only once per session</li>
  </ul>
  
  <p>I'm migrating over from another tag manager that has a very simple way of doing this so surely I am missing something.  I've looked at implementing Triggers but that doesn't seem to have what I want either.</p>