Time formatting for org clocktable report - emacs

Question

I use org-clock table to track time. It is more convenient for me to see time in hours, not in days. How could I configure org clocktable to do that?
Here is what I get now:
* A
:LOGBOOK:
CLOCK: [2020-05-08 Fri 10:37]--[2020-05-08 Fri 23:37] => 13:00
CLOCK: [2020-05-07 Thu 13:37]--[2020-05-07 Thu 23:37] => 10:00
:END:
* D
:LOGBOOK:
CLOCK: [2020-05-08 Fri 03:37]--[2020-05-08 Fri 05:37] => 2:00
CLOCK: [2020-05-06 Thu 03:37]--[2020-05-06 Thu 05:37] => 2:00
:END:
#+BEGIN: clocktable :scope file :maxlevel 2
#+CAPTION: Clock summary at [2020-05-08 Fri 19:40]
| Headline | Time |
|--------------+-----------|
| *Total time* | *1d 3:00* |
|--------------+-----------|
| A | 23:00 |
| D | 4:00 |
#+END:
Note "Total time" is "1d 3:00". I want total time to be shown as 27:00.

Answer 1

The time format is controller by the variable org-duration-format which has a very long description (C-h v org-duration-format RET). I quote selectively here:
The value can be set to, respectively, the symbols ‘h:mm:ss’ or
‘h:mm’, which means a duration is expressed as, respectively,
a "H:MM:SS" or "H:MM" string.
So adding this to the file:
#+begin_src emacs-lisp
(setq org-duration-format 'h:mm)
#+end_src
and evaluating it with C-c C-c will allow the clocktable to look like this:
#+BEGIN: clocktable :scope file :maxlevel 2
#+CAPTION: Clock summary at [2020-05-11 Mon 22:10]
| Headline | Time |
|--------------+---------|
| *Total time* | *27:00* |
|--------------+---------|
| A | 23:00 |
| D | 4:00 |
#+END:
You can also of course customize the variable if you want to avoid code.
Also, if you don't like the asterisks, you can customize the variable org-clock-total-time-cell-format whose default value is the string *%s*.