Question: How can I retrieve, over a set of files S
(in particular: over my agenda files + their archive files) the total time clocked (as the return value of an elisp function; not as a clock table)? So for example, if I have:
* Header1
:LOGBOOK:
CLOCK: [2019-05-01 Sat 18:10]--[2019-05-01 Sat 18:30] => 0:20
:END:
# File2
* Header2
:LOGBOOK:
CLOCK: [2019-05-11 Sat 18:10]--[2019-05-11 Sat 18:11] => 0:01
:END:
* Header3
:LOGBOOK:
CLOCK: [2019-05-11 Sat 18:10]--[2019-05-11 Sat 18:20] => 0:10
:END:
I'd like to run a function like (sum-all-time-from "[2019-05-10]" "[2019-05-12]")
to get as answer ~0:11~.