Emacs Org Mode: How To Stop Total in Column View Showing Number of Days?

Question

I'm using Emacs 23.4.1 and Org-Mode 8.0.6

In my org file I have the estimated number of hours that a task will take using the Effort property of the associated heading. For example:

* My Tasks
** TODO Read a book...
** TODO Watch a film...
** TODO Learn org-mode
   :PROPERTIES:
   :Effort:  2:00
   :END:

Then I can switch to column view and view the total time estimated for all of "my tasks". I do this by adding the following line to my org file:

#+COLUMNS: %55ITEM(Details) %5Effort(Time){:}

When the total number of hours is greater than 24, then the total is displayed in terms of days and hours, e.g. 3d 14. How can I format the display so that it tells me the total number of hours (and minutes), rather than breaking it into days?

(In short, I want the total effort of "My Tasks" to display 86:00, rather than 3d 14.)

Answer 1

See the var org-time-clocksum-format:

;; format string used when creating CLOCKSUM lines and when generating a
;; time duration (avoid showing days)
(setq org-time-clocksum-format
      '(:hours "%d" :require-hours t :minutes ":%02d" :require-minutes t))

Answer 2

The accepted answer did not work for me. I was going to display CLOCKSUM in hours. This worked:

(setq org-duration-format 'h:mm)