title: matplotlib, pandas, how to generate a histogram of timedeltas?
body: <p>I have a pandas.DataFrame <code>df</code> with that contains the following series:</p>
  
  <pre><code>Time
  2182447     0 days 05:44:00
  2182447     0 days 05:49:00
  3129563     0 days 22:09:00
  13341029    0 days 16:49:00
  13341029    0 days 16:58:00
  25622668    0 days 08:24:00
  25622668    0 days 08:28:00
  30077018   24 days 15:01:00
  30077018   24 days 15:09:00
  20131954    0 days 06:18:00
  </code></pre>
  
  <p>I would like to plot a histogram of the timedeltas. However:</p>
  
  <pre><code>hist(df)
  df.Time.hist()
  # both functions give the same error
  &gt;&gt;&gt; TypeError: Cannot cast ufunc less input from dtype('float64') to dtype('&lt;m8[ns]') with casting rule 'same_kind'
  </code></pre>