from our testing it seems that you have to build up time (upkeep). So in other words if you are present in the flag area for 1 hr - you get an hr of protection. You get seconds adding to the timer while you're there - and when you leave the timer starts reversing, if that makes sense. (to a maximum of 259,000 seconds {3 days}). Or I could be completely wrong and the things is broken. totally.