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ms sql server time duration in decimal

Last Modified: 2015-03-16
we have sql server table with a decimal time duration column (in milliseconds) for each detail record. The column name is "duration". Example of the records values:
rec 1       468
rec 2     2375
rec 3     1172

if we need to know the total time duration for the 3 records can we just sum the 3 records and then covert to time format.
i was using:   sum(cast (duration as bigint) as TotDuration
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