Was looking around for this. Although when I just logged in, haven't post anything, I tried to send a PM and it said my last activity is less than 360 seconds ago. Doesn't make sense... Does sending PM count as 1 activity?
Yes and so does logging in and attempting to post. Make sure you wait the full six minutes before you try do anything and you should be fine. The time you have to wait goes down drastically the more activity you get so you don't have to bare it for long.