title: How to set the expiration of a background task agent in windows phone 7 to never expire?
body: <p>I am designing an application where the user selects the option to update his live tile and can forget about the app. Once he picks the option to update, I kick off a background task agent. But it looks like as per msdn, the background task agent will only run for upto two weeks. </p>
  
  <p>How do I fire it again without having the user to come into the app?</p>