I believe the system prevents you from posting unless it's been something between 5+ to X amount of minutes? Some have been nearer to 10 minutes.
Either way, I think this flood control might be too strict especially for tournament threads where it is basically LR discussion like in the BW days.
Granted the LoL forums are generally quite slow and I can understand if the cost benefit of lowering it isn't worth it (perhaps only I care, I'm surprised no one else has brought it up), but I also doubt that spam bots are that much of a problem in this forum to the point that the flood control has to be set over 5 minutes per user for a thread.
I think anything <5 minutes would be fairly reasonable.
It'd just be a lot more convenient when I'm actively replying to posts, especially on those lunch breaks