Mixi, one of the biggest Japanese social network service, supports OAuth2 with 
refresh_token.
The lifetime of refresh_token is 6 hours ~ 3 months depends on user's decision 
on authorization.

In that case, how can Mixi tell the lifetime of refresh_token?
Currently they just documented it in their API document.

On 2011/02/04, at 5:43, William Mills wrote:

> The general use case for refresh tokens is that they don't have a lifetime, 
> although they can be invalidated by various things.
> 
>> -----Original Message-----
>> From: [email protected] [mailto:[email protected]] On Behalf
>> Of Phil Hunt
>> Sent: Thursday, February 03, 2011 12:27 PM
>> To: OAuth WG
>> Subject: [OAUTH-WG] Refresh Token and Expires_in
>> 
>> In 5.1 (draft 12), if a refresh_token is returned with an access_token,
>> what does expires_in refer to? Strict reading of the spec says it
>> refers to the access_token, but isn't lifetime of the refresh token as
>> important?  Should there be a similar "refresh_expires_in"?
>> 
>> Apologies if this was discussed before.
>> 
>> Phil
>> [email protected]
>> 
>> 
>> 
>> 
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