Question about expires_in default value

[FujiNguyen]

My understand is that the expires_in is 3600 (1 hour).  However the online documetation has default  28800 (8 hours).   When requesting Access Token via the WebApi Authorization Code Grant Flow , the expires_in is indeed 28800. 

This is somewhat confusing.  Should it be 3600? 

[JeremiahFitbit · Accepted solution]

The default and recommended expiration time was increased to 8 hours. Specifying an expiration time does not guarantee the API will return the requested expiration time.

[FujiNguyen]

That explained it.   Thank you for the asnwer.