I am referring to the access token one can obtain using the following url.
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If you request offline_access permission then the access_token will not expire. However there is a major change in authentication coming up. As of October 3, 2012, the offline_access permission will be deprecated. So if you are building any new application DO NOT use this permission. Below is the change documentation by Facebook:
https://developers.facebook.com/roadmap/#october-2012
Also more details on the removal of this permission:
https://developers.facebook.com/roadmap/offline-access-removal/