...+ ':' + CAST(FLOOR((DATEDIFF(mi,[Open Date & Time],[Close Date & Time]) / 60 - FLOOR(DATEDIFF(mi,[Open Date & Time],[Close Date & Time]) / 60)) * 60) AS varchar(2)) AS castHourMin,
CONVERT(varchar(10),DATEDIFF(mi,[Open Date & Time],[Close Date & Time])/60) + ':' +...