Since we are trying for perfection, here we go.
In management -->webadmin settings. All the settings are instant. They either force you to log out or you are logged out automatically. Everything but log out interval. If you change your logout interval, and hit apply it will show that the settings applied but they are not applied unless you go to a different page, logout or start a new session. I tested with 60 seconds and hit apply and I should be logged out within 60 seconds but I am not. You can hit apply twice and you will be logged out in 60 seconds.
Here is the screenshot.
