This fix works for me. 

commit 6107c2b15bf19ab5300c2861db365a3dc310adc6 (origin/maint)
Author: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Date:   Mon May 10 18:00:58 2021 +0200

    Revert "agenda: Fix "org-duration-to-minutes: Invalid duration format" error"
   
    This reverts commit bc857bfc62ba94e04fb338bfb35f4b612c114d0c.
   
    The "fix" breaks elsewhere, as reported below.
   
    Reported-by: Daniel Ortmann <daniel.ortmann@oracle.com>
    <http://lists.gnu.org/r/emacs-orgmode/2021-05/msg00592.html>

On 5/10/21 9:25 AM, Nicholas Savage wrote:
Thanks for the report. This was also reported last night too: https://urldefense.com/v3/__https://lists.gnu.org/archive/html/emacs-orgmode/2021-05/msg00592.html__;!!GqivPVa7Brio!Non_TqJOEgfushDGmmgrZySe4dyz4pr69tdmeFRzKzRUwzoLORtfh7pMyW2pU_1ZotQ$ 

I'll probably have a chance to look into this sometime today, but it probably won't be until this evening if anyone else has a chance earlier than that.

On Mon, May 10, 2021, at 09:54, Detlef Steuer wrote:
Am Mon, 10 May 2021 16:45:30 +0300
schrieb Jarmo Hurri <jarmo.hurri@iki.fi>:

Greetings.

To get my work done, I had to switch from master branch to stable, but
now I started getting "invalid duration format" error when trying to
create my daily agenda:

org-duration-to-minutes: Invalid duration format: #("12:45-14:15 +1w"
0 15 (fontified nil org-category "schedule"))

Here is the corresponding row, and the preceding row, from file
schedule.org:

<2021-04-15 Thu 09:15-10:45 +1w>
<2021-04-19 Mon 12:45-14:15 +1w>

Any hints?

Jarmo



Can confirm!

Detlef


-- 
"Wozu leben wir, wenn nicht dazu, uns gegenseitig das Leben 
 einfacher zu machen. (George Eliot)" 

Dr. Detlef Steuer
Helmut-Schmidt-Universität
Fakultät WiSo
Holstenhofweg 85
22043 Hamburg

Tel:  040/6541-2819
mail: steuer@hsu-hh.de