DO NOT CLICK ANYWHERE FOR 360 SECONDS. 6 minutes then you can click around and post...
Clicking and browsing around is fine, just don't submit anything or you'll have to wait again.
I believe the timer won't reset for those fail attempt to post with the 360s error.
Don't click "back", but instead go back to the thread and click reply once again.
From my own experience (when I was having <15 activity), it should work