How are the cells formatted where your initial entries are? You need to enter them as hr:min or hr:min:sec. You can format your difference as [mm] or [mm]:ss. See attached. Does this help?
ChemistB
How are the cells formatted where your initial entries are? You need to enter them as hr:min or hr:min:sec. You can format your difference as [mm] or [mm]:ss. See attached. Does this help?
ChemistB
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