(#3)As a wikian I have something to say here.
It is 180 seconds because you have much more power in the Wiki than the forums.
The time limit also gets removed automatically when you become a Wikian anyways (if your wiki account is at least 30 days old and has over 100 edits), so…
Also this limit encourages people to write more and learn how the wiki works instead of rushing their edits and ending up with a bunch of typos and bad formatting.ᶜᶦᵗᵃᵗᶦᵒⁿ ⁿᵉᵉᵈᵉᵈ