[Orgmode] Effort estimates for multi-day tasks

[Markus Heller]

Hello all,

please consider the following scenario:

* Task A
** Task B
   This task requires 3 full days @ 8 h each day.
   :PROPERTIES:
   :Effort: ????
   :END:

How would I estimate the effort for task B?  Set it to 24:00?  That's
unhandy if you have something like the following in your .emacs:

;; global Effort estimate values
(setq org-global-properties (quote (("Effort_ALL" . "0:05 0:15 0:30 1:00 1:30 
2:00 2:30 3:00 3:30 4:00 4:30 5:00 5:30 6:00 6:30 7:00 7:30 8:00"))))

The other option would be to break up task B in 3 subtasks like this:

* Task A
** Task B
   This is now just a container task
*** Task B1
    :PROPERTIES:
    :Effort: 8:00
    :END:
*** Task B2
    :PROPERTIES:
    :Effort: 8:00
    :END:
*** Task B3
    :PROPERTIES:
    :Effort: 8:00
    :END:

What do the org-mode experts consider to be the best solution to
estimating the efforts of multi-day tasks?

Any input is appreciated.

Thanks and Cheers
Markus