if object_id('tempdb..#Something') is not null
	drop table #Something
	
create table #Something
(
	Div_Time datetime,
	Unit_id varchar(25),
	Filled_time datetime
)

insert #Something
select '1/1/2013 01:00', 'Machine5', '1/1/2013 12:10' union all
select '1/1/2013 01:00', 'Machine5', '1/1/2013 12:15' union all
select '1/1/2013 01:15', 'Machine7', '1/1/2013 12:19' union all
select '1/1/2013 01:15', 'Machine7', '1/1/2013 12:19'

select distinct s1.Div_time, s1.Unit_id
from #Something s1
join #Something s2 on s1.Div_Time = s2.Div_Time and s1.Filled_time <> s2.Filled_time

SELECT
    tt1.ID
   ,tt1.Mach_Name AS [MachineName]
   ,tt1.Div_Time AS [1stDivTime]
   ,tt1.Filled_Time AS [1stFilledTime]
   ,tt1.Diff1 AS [1stDuration]
   ,tt2.Div_Time AS [2ndDivTime]
   ,tt2.Filled_Time AS [2ndFilledTime]
   ,DATEDIFF(MINUTE,tt2.Div_Time,tt2.Filled_Time) AS [2ndDuration]
   ,DATEDIFF(MINUTE,tt2.Div_Time,tt2.Filled_Time)-tt1.Diff1 AS [Diff]
FROM
    (
    SELECT 
        *
       ,DATEDIFF(MINUTE,Div_Time,Filled_Time) AS [Diff1]
    FROM
        #TempTable
    ) AS tt1
    INNER JOIN 
        #TempTable AS tt2
        ON tt1.ID = tt2.ID-1
            AND tt1.Reading = 1
            AND DATEDIFF(MINUTE,tt2.Div_Time,tt2.Filled_Time)-tt1.Diff1 <> 0

ID MachineName 1stDivTime              1stFilledTime           1stDuration 2ndDivTime              2ndFilledTime           2ndDuration Diff
1  Machine5    2013-01-01 01:00:00.000 2013-01-01 12:10:00.000 670         2013-01-01 01:00:00.000 2013-01-01 12:15:00.000 675         5
7  Machine11   2013-01-01 01:45:00.000 2013-01-01 12:40:00.000 655         2013-01-01 01:45:00.000 2013-01-01 12:28:00.000 643         -12

SELECT Div_time, Unit_id
    ,TimeDifferenceMin=DATEDIFF(minute, MIN(Filled_Time), MAX(Filled_Time))
FROM #Something
GROUP BY Unit_id, Div_time
HAVING MAX(Filled_Time) <> MIN(Filled_Time)