title: Convert value in timediff() into string for mysql
body: <p>I have a query to get hour between times. For example, I get the results 1:50 from the query.</p>
  <pre><code>select TIMEDIFF(time_start,time_end) hours from booking_submit
  </code></pre>
  <p>How to convert value in timediff() into something like '1 hours 50 minutes'?</p>