There have been multiple countdowns so far.
Either they are fake decoys and there is only one real one (The booms? How many boom events so far? What happens when the 6th occurs?) occuring "behind the scenes" in a larger timeframe or yet to occur.
Or they are distinct countdowns pertaining to sub-operations. Single arrests, or perhaps the booms? Or just important movement cues?
My thought is they are different countdowns for different teams around the world. The teams watch for the country name (not necessarily the country they are in) or topic of the post and verify the "go" once the countdown is complete. It's a lot bigger than just DC or even the US.