Hi
user access token expires after 2 months. Regenerate token. But if you login to the fb app (regenerating token from token page, follow doc about how to do) at any day within that two months then token will be extended another two months from that day. That's a rule of facebook implying you visit the app at least once in 2 months. Nonetheless, if you need non-expired token then you need an application token for which i have to make the server side version of the module, paid work. Email for details.