People will be able to choose any post within the current month. So it doesn't have to be within the payout window. There will be a post from us about 10 days before the end of the month where people can submit the url to the post of their choice as a comment. If people fail to submit a post, they won't be kicked out immediately but they will have only 50% of the points of the previous post that they submitted. There will be a final date around the end of the month where we make the ranking. Thanks for your questions!