I believe that ticket expiration is directly correlated to the duration of the gateway session which by default is 240 minutes. This can be modified by tabadmin set wgserver.session.idle_limit xxx
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Not answering your question, but as an aside, the maximum time to redeem a trusted ticket only defaults to 3 minutes, but that length of time is actually a configuration value for Tableau Server.
You're right. I tested and that's it.