This is the official manual for the latest Org-mode release.

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3.5.4 Durations and time values

If you want to compute time values use the T flag, either in Calc formulas or Elisp formulas:

       |  Task 1 |   Task 2 |    Total |
       |---------+----------+----------|
       |    2:12 |     1:47 | 03:59:00 |
       | 3:02:20 | -2:07:00 |     0.92 |
       #+TBLFM: @2$3=$1+$2;T::@3$3=$1+$2;t

Input duration values must be of the form [HH:MM[:SS], where seconds are optional. With the T flag, computed durations will be displayed as HH:MM:SS (see the first formula above). With the t flag, computed durations will be displayed according to the value of the option org-table-duration-custom-format, which defaults to 'hours and will display the result as a fraction of hours (see the second formula in the example above).

Negative duration values can be manipulated as well, and integers will be considered as seconds in addition and subtraction.