So seems to me that Xinarae* has already saved (draft) all or some of his 20 posts needed and today he only had to click to post button, and this explains how was he able to post 2 to 3 posts in under 2 mins.
I wouldn't be surprised if it's a bot where someone can just write up a large number of posts and then slowly use their stash of posts over time. Neat observation.
This sort of behaviour is probably more common than people think, especially if you have a lot of accounts and you can get away with it very easy in generic spam threads. I suspect it's been happening even more lately especially on the Stake campaign.
BTW, Xinarae* is currently serving out a second ban for spamming/post-bursting. Interestingly enough, there's an account named Xinarae which is permabanned: https://bitcointalksearch.org/user/xinarae-844011 Xinarae May 19, 2016
His last post was on September 07, 2016. Xinarae* signed up on September 12, 2016 so this is probably ban evasion.
https://bitcointalksearch.org/user/xinarae-898552 Xinarae* September 12, 2016
Update: he's at 20, so must be done. He was last active the moment he posted his 20th post.
