No need to convert. Times are stored as fractions of a day (and displayed
according to the rules for time) so all calculations will work correctly.
You may have to format your result explicitly as time.
If times 24 hours are involved, format as [h]:mm to avoid tipping over at
24h

"Leslie" wrote in message
...
I need an average time, does Excel automatically do the correct computation
(60 vs 100) if the field is formated as a time, or do I need to convert
the
times to numbers?