Working with time periods that exceed 24 hours in Excel

Neaten up your time sheets with this custom cell format.In Microsoft Excel, you can format a cell containing the sum of amounts of time that exceed 24 hours with the number format "[h]:mm:ss"; Microsoft Excel automatically adds times beyond 24 hours and formats them correctly.

  1.  To add times with a sum that exceeds 24 hours, use a normal sum formula: =SUM(Range)
  2. Then, click Cells on the Format menu, click the Number tab, click Custom in the Category [h]:mm:ss

  This format works correctly with times that exceed 24 hours.  

Note: Range is either the defined name of a range that contains the times or the cell reference of the range that contains your times (for example, A1:A4). The values in the range must be in the "h:mm" or "hh:mm" format.  

(from http://support.microsoft.com/kb/190633)

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