Thanks for the inquiry, @paulkd.
Welcome to the Roku Community!
Currently, the "Guest mode" feature will only automatically sign out the guess on their selected sign-out date.
For full information on this, you can take a look at this link: How do I set up Guest Mode on my Roku® streaming device? | Official Roku Support
Let me know if you have any other questions, and have a good day!
Regards,
Mary
Mary F.
Roku Community Moderator