Hi Stephen,
As part of the new timeout changes, basically this is how it works:
1- The Default and Maximum allowable limits can be adjusted in /admin
2- The admin controls the limits for the users in Administration > Account Preferences
3- The users can work with the limits set by the admin in step 2
4- Set_Timeouts also works within the limits set by the admin in step 2
The following page demonstrates the timeouts in details:
https://subject7.atlassian.net/wiki/spaces/SD/pages/687734799/Account+Preferences
Regards,
Subject7 Team