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Yes, they currently have a 24 window for payout. Lots of discussion right now about making payouts permanent so authors receive rewards no matter when they get the votes.

Hi, so do you mean that if you don't comment/upvote a post within the first 24 hour period of its posting time, it is not longer valuable to curate?

Actually, after reading the white paper I've learned that the payout window gets extended as people keep voting on the content. Also, once the content payout happens, it can restart if more people vote on the content later.