If you were scheduled for one day and then this date changed, this means that your mining tempo has changed. The estimated payout date is always calculated in regard to your mining tempo of the last hour.
If you don't mine for a while and you haven't reached the minimum payout balance yet, then the estimated payout time is set to Unknown. To see the estimated payout date again, you can start mining again and after an hour the date will be calculated again.
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