- Before Org-Mode Version 9.1
You can set the org-time-clocksum-format
variable like this :
(setq org-time-clocksum-format (quote (:hours "%d" :require-hours t :minutes ":%02d" :require-minutes t)))
- Org-Mode Version 9.1 and up
You should now use org-duration-format
:
(setq org-duration-format (quote h:mm))
See this for explanations on the update.
See this for the Org-Mode release notes.