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select count (*) K from Posts p1 inner join Posts p2 on p1.AcceptedAnswerId = p2.Id where p1.PostTypeId = 1 and p2.PostTypeId = 2 and p2.ParentId = p1.Id and p1.OwnerUserId is not null and p2.OwnerUserId is not null group by datediff(mi, p1.CreationDate, p2.CreationDate) having datediff(mi, p1.CreationDate, p2.CreationDate) > 50940