Screen timeout versus secured lock time I just updated to Jelly Bean on my GS3 and am mostly impressed. 

I am having trouble with the screen timeout setting, however.  When I go into Display>Screen Timeout and select a time, say 30 seconds, I get a message that says "Screen will turned off when screen is locked.  Secured lock time is currently set to 5 seconds." My question is where? I cannot find this Secured Lock time setting in Display settings, Lock Screen settings or Security settings, which would seem to be the intuitive places to look for it. Further, even though I get this message, my screen now does not turn off at after 5 seconds, or ever as far as I can tell.  After walking away from the phone for 20 minutes, I returned to the screen  blazing in all its AMOLED glory.
Your problem is not in display but in Lock screen. I had the same problem and fixed it: Go to settings, lock screen, then secured lock time, and set it for ten minutes