Elapsed Time Calculation?

K

Ken

Excel 2000 ...

Col F = Dates (format = mm/dd/yy)
Col H = Time Stamps (format = 1:30 pm)
Col K = Serial#'s

I need formula to calculate "elapsed time" between 1st &
last Date/Time stamps for each Serial#.

(Note: each Serial# has random # of time stamps)

Thanks ... Kha
 
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