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access token get refreshed then how long it will expired again

I have session timeout setting as 1 hours, and my initial access_token seems timeout around this time. This is excepted. 

And after it timeout, i did token refresh and get a new access_token, then i observed this refreshed access_token seems not timeout in 1 hours, even 5~6 hours after, it still not expired. 

So is there refresed access_token never expire? Can someone explain more about this?