are you sure activity is updated every 30 mins .. because i don't think so.. atleast not for newbie member..!
You can only get a max 14 activity every two weeks. Not sure what the 30 minutes means.
DONE
grt can you also add the time limits members has to face like as a newbie i must wait 360secs before posting a new comment.. ! what is the time limit for jr. members , members nd others..?