L2: =K2-J2
M2: =SUM($L$2:L2)

and copy down. Make sure the M cells are formatted as [hh]:mm:ss to cater
for more than 24 hours

--

HTH

RP
(remove nothere from the email address if mailing direct)


"Ken" wrote in message
...
I need to track time? In col. j2 & k2 are formated with
custom H:MM:SS. In L2 im looking to get the span of time
in H:MM:SS. In M2 average span of time (cumul)??

any feed back would of great help.
thank you
Ken