facebook access token with no expire date

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ASP.NET

PHP

Facebook-API

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hi
i generate facebook access token to get wall feeds of page,profile,group using fb graph api by the following way -

http://itslennysfault.com/get-facebook-access-token-for-graph-api[^]

i also get a expire date value as 1366068618.how many days it implies? is the access token generated above way valid for all times? if not tell me correct way to generate access token for above purposes using graph api and that token will not expire