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--accepted answer

select a.*,b.*,
row_number() over (partition by a.Id order by b.CreationDate) as r
from Posts a inner join Posts b
on a.PostTypeId = 1
and b.PostTypeId = 2
and b.ParentId = a.Id
and DATEDIFF(mi,a.CreationDate,b.CreationDate) < ##MaxDuration##
order by a.Id

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edited sep 30 13

created aug 16 13 Eat A Peach