* Overview

  The ~ATTR_LATEX~ and ~TBLFM~ lines will wander to the right with every ‘C-c C-c’
  on the columnview.

  #+BEGIN: columnview :hlines 1 :id "tasks"
  #+ATTR_LATEX: :width \textwidth
  | <40>  |                  |               |       |
  | Task  | Estimated Effort | Actual Effort |       |
  |-------+------------------+---------------+-------|
  | Tasks |            20:00 |               | 20.00 |
  | Foo   |             8:00 |               |  8.00 |
  | Bar   |            12:00 |               | 12.00 |
  #+TBLFM: $4=$2;t
  #+END:

  
* Tasks
  :PROPERTIES:
  :ID: tasks
  :END:
  
** TODO Foo
   :PROPERTIES:
   :Effort:   8:00
   :END:
  
** TODO Bar
   :PROPERTIES:
   :Effort:   12:00
   :END: