[O] How to estimate effort by week?

[Christoph LANGE]

Dear all,

is there any way of estimating effort by week?  I have some tasks on 
which I don't want to waste too much time per week.  For other tasks, on 
which I don't want to waste too much time per _day_, I can use the 
following properties:

   :PROPERTIES:
   :CLOCK_MODELINE_TOTAL: today
   :Effort:   0:15
   :END:

There is no immediate equivalent for a week (or for any other timespan). 
 But is there possibly some workaround?

Cheers, and thanks,

Christoph

--
Christoph Lange, http://www.facebook.com/ch.lange, Skype duke4701