title: How long does a session cookie last? When should I reauthenticate?
body: <p>How long can I use a <strong>session</strong> cookie? I have a client application where I authenticated to a SharePoint site and I am using the cookies for navigating through the subsites. I am <strong>saving the cookie and reusing the headers</strong> to login to the site at a later point without authenticating again. There is no expiration date set. How long will the cookie last and when should I authenticate back again?</p>