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There was a discussion about it long ago, I can't remember the details, but it was something like "technical limitations" having to do with the blockchain. This was back when there were two payout periods - 24 hours and 30 days. So obviously, the blockchain can handle multiple payouts, and it can handle 30 days or more. I suspect that the short payout periods has always been about getting lots of content as quickly as possible, in order to increase Google rankings.

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