title: timediff is greater than 2 minutes
body: <p>I am trying to write a query where I can eliminate a timediff of less than 2 minutes. I have tried variations on the following which returns no results</p>
  
  <pre><code> timediff(sessions.producer_on,sessions.producer_off)&gt;'00:02:00'
  </code></pre>
  
  <p>the timediff without the > works fine and returns all results  - I am having difficulty with the >00:02:00 condition. Can anyone help - many thanks</p>