Facebook Expiration Time offline_access

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When I call the endpoint:

https://graph.facebook.com/oauth/access_token?client_id=clientID&client_secret=secretKEY&grant_type=fb_exchange_token&fb_exchange_token=VALIDACESSTOKEN

I get this answer:

access_token=NewACCESSTOKEN&expires=6271

What is the unit of the expire time? Seconds? Hours?

Thanks in advance.


It's in seconds before it expires.