title: How often is background fetch executed in iOS?
body: <p>In iOS 7, a background fetch mode is supported for apps to fetch data when the app is not frontmost:</p>
  
  <blockquote>
    <p>When it is convenient to do so, the system launches or resumes the app in the background and gives it a small amount of time to download any new content.</p>
  </blockquote>
  
  <p>My question is: how often is the background fetch code executed?</p>
  
  <p>If I set the minimum interval:</p>
  
  <pre><code>[[UIApplication sharedApplication] setMinimumBackgroundFetchInterval:10];
  </code></pre>
  
  <p>Does it get execute every 10 seconds, or maybe once a day? What kind of interval  should I expect, generally?</p>