title: mongoengine default timeout configuration
body: <p>I have a django project running on top of MongoDB via mongoengine. 
  After I got inconsistent results for list querysets (object.filter() etc.) I've set the queryset to run without a timeout - by calling queryset.timeout(False) - and that seemed to solve the issue.<br>
  My questions are:
  1. What is the default timeout settings for mongoengine?
  2. Is there a way to control the timeout configuration for mongoengine?</p>