title: Storing hours, minutes and seconds effectively
body: <p>Using a PostgreSQL database, what is the best way to store time, in hours, minutes and seconds. E.g. "40:21" as in <em>40 minutes and 21 seconds</em>.</p>
  
  <p>Example data:</p>
  
  <pre><code>   20:21
   1:20:02
  12:20:02
     40:21
  </code></pre>