Start time in A1,
End time in B1,
Enter this formula in a cell formatted as "General" or "Number":

=(B1-A1+(B1<A1))*24*AND(A1<0,B1<0)

Both A1 and B1 must have times entered for this to work.
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HTH,

RD
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Please keep all correspondence within the Group, so all may benefit!
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"highball" wrote in message
...
Example 01/12/05 13:00 to 01/13/05 02:00 should = 13 hours

problems with time