title: Facebook access token expiration
body: <p>I am a little confused about calculating the time until the access token expires.</p>
  
  <p>I am using server authentication (http://developers.facebook.com/docs/authentication/server-side/).</p>
  
  <p>When I get the authentication code from the Facebook's request to my redirect URL, I send an authentication request back to Facebook and I get the access token along with 'expires' parameters, lately I could see that the expires is a long value that represents the time in seconds until the token expires. For some reason I think it used to be time in miliseconds. </p>
  
  <p>Can I assume that the expiration time is now + expires (in seconds) - it seems to me too long (about ~5109691 seconds) - does it make sense?</p>
  
  <p>Thank you for your help.</p>