Does not count the suggestededits decided by Community (clicking "improve edit").
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WITH Raw AS ( SELECT Id, DATEFROMPARTS(YEAR(CreationDate), MONTH(CreationDate), 1) AS Month, DATEDIFF(s, CreationDate, COALESCE(ApprovalDate, RejectionDate)) AS TimeS FROM SuggestedEdits WHERE ApprovalDate IS NOT NULL OR RejectionDate IS NOT NULL ) SELECT Month, PERCENTILE_DISC(0.5) WITHIN GROUP (ORDER BY TimeS) OVER (PARTITION BY Month) FROM Raw ORDER BY Id DESC