The API guide uses the PowPersistentSession.Store.PersistentSessionCache
for renewal tokens which by default lasts 30 days. So all you have to do is to set up your client logic to renew the session with the renewal token when the session token no longer works (as is needed in any case, since the session token only lives for 30 minutes). You are able to renew the session for up to 30 days with the renewal token.
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