title: how long is token valid? Django REST Framework
body: <p>I am using Django Rest Framework token-authentication mechanism. </p>
  
  <p><a href="http://www.django-rest-framework.org/api-guide/authentication#tokenauthentication" rel="noreferrer">http://www.django-rest-framework.org/api-guide/authentication#tokenauthentication</a></p>
  
  <p>It creates database table with field <code>created</code> with the value equal to the timestamp, when te token was created. E.g: <code>2014-04-07 07:42:50.395626</code></p>
  
  <p><strong>Anyone knows how long is this token valid?</strong> I can not find this info on mentioned website.</p>
  
  <p>I am also wondering, that this token is still valid, even when the user changes password. Shouldn't it generate a new one, or at least make the old on no more valid?</p>