Palmetto's formula will work for you even if you use AM/PM as long as it is formatted as time and not text. However yours are formatted as (text 6a is not a valid time format). If you go through the trouble of converting them all (e.g. 6a to 6:00 AM), then starting in C12That can be dragged and copied to all your green cells. Does that work for you.
=IF(AND(ISNUMBER(B12),ISNUMBER(B13)),(B13-B12)*24,"")
Last edited by ChemistB; 08-19-2009 at 04:35 PM.
ChemistB
My 2?
substitute commas with semi-colons if your region settings requires
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