title: When will a google oauth2 refresh token expired?
body: <p>When will a google oauth2 refresh token expired?</p>
  
  <p>What I mean by expiration is <b> expiration because of a certain time span had been passed </b> (not because user has revoked access or because user has requested new refresh token)</p>
  
  <p>I have done some research and none of them cited official google documentation (I can't find a valid google documentation too)</p>
  
  <hr>
  
  <p>Some other questions said that it's never expired because of <b> time </b>:</p>
  
  <p><a href="https://stackoverflow.com/questions/8953983/do-google-refresh-tokens-expire">Do Google refresh tokens expire?</a></p>
  
  <p><a href="https://community.fitbit.com/t5/Web-API-Development/Invalid-or-expired-refresh-tokens/td-p/1048159" rel="nofollow noreferrer">https://community.fitbit.com/t5/Web-API-Development/Invalid-or-expired-refresh-tokens/td-p/1048159</a></p>
  
  <p>While others said that it will expire (some say 14 days, others said 60 days)</p>
  
  <p>this one said 14 days <a href="https://stackoverflow.com/questions/15564486/why-do-refresh-tokens-expire-after-14-days">Why do refresh tokens expire after 14 days</a></p>
  
  <p>this one said 60 days <a href="https://blog.box.com/blog/oauth2-update-longer-lived-refresh-tokens/" rel="nofollow noreferrer">https://blog.box.com/blog/oauth2-update-longer-lived-refresh-tokens/</a></p>
  
  <p>this one said "very long time" (no exact time) <a href="https://medium.com/@bantic/more-oauth-2-0-surprises-the-refresh-token-1831d71f4af6" rel="nofollow noreferrer">https://medium.com/@bantic/more-oauth-2-0-surprises-the-refresh-token-1831d71f4af6</a></p>
  
  <hr>
  
  <p>Because of a certain requirement, I need to have a refresh token that never expire because of <b> passing of time </b>, so <i> I require a refresh token that can still be used after like 20 years or so </i></p>
  
  <p>If refresh token expires before that time, then I will need to change my approach, so I need to know if they expires or not</p>