title: backgroundTimeRemaining less than 10 seconds on iOS 7
body: <p>I am periodically getting a ~9 second background time remaining. I believe it should be close to 180 seconds.  However that's not what I am seeing.</p>
  
  <pre><code>- (void)applicationDidEnterBackground:(UIApplication *)application
  {
      UIApplication *app = [UIApplication sharedApplication];
      double secondsToStayOpen = app.backgroundTimeRemaining;
     NSLog(@"secondsToStayOpen %f ",secondsToStayOpen);
   }
  </code></pre>
  
  <p>prints</p>
  
  <pre><code>secondsToStayOpen 179.920931 
  secondsToStayOpen 9.959715 
  secondsToStayOpen 9.962670 
  </code></pre>