title: Python Panda Bloomberg xbbg Request time
body: <p>I am requesting data from a large dataframe through xbbg but a lot of the fields are coming back as NaN when the data is actually available on Bloomberg. I suspect that the values are returning null because Bloomberg takes time to update all values and was wondering if there is a way to allow for a longer response time from BBG before the data is returned.</p>
  <p>This is an example of the data request:</p>
  <pre><code>u=blp.bdp(x['cusip'],\
  flds=['INTERVAL_PERCENT_CHANGE', 'TICKER_AND_EXCH_CODE'],\
  calc_interval='1Q',\
  start_date_override=x['date']).values
  </code></pre>
  <p>Thanks!</p>