* clocking
** task A
CLOCK: [2013-09-21 Sat 12:00]--[2013-09-21 Sat 18:00] =>  6:00
CLOCK: [2013-09-19 Thu 14:49]--[2013-09-19 Thu 17:50] =>  3:01
CLOCK: [2013-09-19 Thu 08:49]--[2013-09-19 Thu 11:50] =>  3:01
** task B
CLOCK: [2013-09-20 Fri 08:49]--[2013-09-20 Fri 18:50] => 10:01
CLOCK: [2013-09-19 Thu 11:50]--[2013-09-19 Thu 14:40] =>  2:50
** task C
CLOCK: [2013-09-18 Wed 08:00]--[2013-09-18 Wed 14:50] =>  6:50
CLOCK: [2013-09-17 Tue 08:35]--[2013-09-17 Tue 18:50] => 10:15
CLOCK: [2013-09-16 Mon 08:45]--[2013-09-16 Mon 16:50] =>  8:05
** Summary
#+BEGIN: clocktable :maxlevel 2 :scope file :formula %
#+CAPTION: Clock summary at [2013-09-29 Sun 13:29]
| Headline   | Time    |         |     % |
|------------+---------+---------+-------|
| *Total time* | *2d 2:03* |         | 100.0 |
|------------+---------+---------+-------|
| clocking   | 2d 2:03 |         | 100.0 |
| \__ task A |         |   12:02 | 587.0 |
| \__ task B |         |   12:51 | 626.8 |
| \__ task C |         | 1d 1:10 |  56.9 |
#+TBLFM: $4='(org-clock-time% @2$2 $2..$3);%.1f
#+END: