Facebook application oauth tokens expire?

Do facebook application access tokens expire? These tokens are used for administrative purposes.

I have had an access token work for more than two weeks, but I would like to see a reference to something official, which I cannot find.

EDIT: I was not clear enough in my initial question. I was referring to the administrative access t开发者_开发百科okens, which are not related to a specific facebook user id.

Access tokens expires when the facebook's user logs out it session, changes the application's permissions or after some time when application is no more used. The only case the access_token does not expire is when the extended permission offline_access has been granted.

Source: http://developers.facebook.com/docs/authentication/permissions ("By default, most access tokens expire after a short time period to ensure applications only make requests on behalf of the user when the are actively using the application.").

It looks like administrative access token do not expire. I have had tokens active for several weeks.