The Org manual (https://orgmode.org/manual/Column-attributes.html)
indicates that an Effort property may be entered as a range like "1-10",
but if I do that I get the error:

org-duration-to-minutes: Invalid duration format: "2-3"

Here is the minimal org file to repro:

========================================
#+COLUMNS: %ITEM(Task) %Effort(Estimate){est+}

* Table
#+BEGIN: columnview :id input

#+END


* Stuff
:PROPERTIES:
:ID:       input
:END:

** First
:PROPERTIES:
:Effort:   2-3
:END:
========================================

Here's the backtrace:

========================================
Debugger entered--Lisp error: (error "Invalid duration format: \"2-3\"")
  signal(error ("Invalid duration format: \"2-3\""))
  error("Invalid duration format: %S" "2-3")
  org-duration-to-minutes("2-3")
  org-refresh-property(((effort . identity) (effort-minutes .
org-duration-to-minutes)) "2-3" nil)
  org-refresh-properties("Effort" ((effort . identity) (effort-minutes .
org-duration-to-minutes)))
  org-refresh-effort-properties()
  org-agenda-prepare-buffers(("/ssdhome/derek/min-org-effort-bug.org"))
  org-map-entries(#f(compiled-function () #<bytecode 0x1b41be5eb54a60a2>)
nil tree archive comment)
  org-columns--capture-view(nil nil nil nil nil 96)
  org-dblock-write:columnview((:name "columnview" :id input
:indentation-column 0 :content #("\n" 0 1 (fontified t))))
  org-update-dblock()
  org-dblock-update(nil)
  funcall-interactively(org-dblock-update nil)
  call-interactively(org-dblock-update nil nil)
  command-execute(org-dblock-update)
========================================

Emacs  : GNU Emacs 28.2 (build 3, x86_64-pc-linux-gnu, GTK+ Version
3.24.33, cairo version 1.16.0)
 of 2023-02-22
Package: Org mode version 9.5.5 (release_9.5.5 @
/usr/local/share/emacs/28.2/lisp/org/)

current state:
==============
(setq
 org-link-elisp-confirm-function 'yes-or-no-p
 org-bibtex-headline-format-function #[257 "\300\236A\207" [:title] 3
"\n\n(fn ENTRY)"]
 org-export-before-parsing-hook '(org-attach-expand-links)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
org-cycle-show-empty-lines
                  org-optimize-window-after-visibility-change)
 org-mode-hook '(#[0 "\300\301\302\303\304$\207" [add-hook
change-major-mode-hook org-show-all append local] 5]
                 #[0 "\300\301\302\303\304$\207" [add-hook
change-major-mode-hook org-babel-show-result-all append local] 5]
                 org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-confirm-shell-link-function 'yes-or-no-p
 outline-isearch-open-invisible-function 'outline-isearch-open-invisible
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
org-src-mode-configure-edit-buffer)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-speed-command-hook '(org-speed-command-activate
org-babel-speed-command-activate)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe
org-babel-header-arg-expand)
 org-link-shell-confirm-function 'yes-or-no-p
 org-babel-pre-tangle-hook '(save-buffer)
 org-agenda-loop-over-headlines-in-active-region nil
 org-occur-hook '(org-first-headline-recenter)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-link-parameters '(("attachment" :follow org-attach-follow :complete
org-attach-complete-link)
                       ("id" :follow org-id-open) ("eww" :follow
org-eww-open :store org-eww-store-link)
                       ("rmail" :follow org-rmail-open :store
org-rmail-store-link)
                       ("mhe" :follow org-mhe-open :store
org-mhe-store-link)
                       ("irc" :follow org-irc-visit :store
org-irc-store-link :export org-irc-export)
                       ("info" :follow org-info-open :export
org-info-export :store org-info-store-link)
                       ("gnus" :follow org-gnus-open :store
org-gnus-store-link)
                       ("docview" :follow org-docview-open :export
org-docview-export :store org-docview-store-link)
                       ("bibtex" :follow org-bibtex-open :store
org-bibtex-store-link)
                       ("bbdb" :follow org-bbdb-open :export
org-bbdb-export :complete org-bbdb-complete-link :store
                        org-bbdb-store-link)
                       ("w3m" :store org-w3m-store-link) ("doi" :follow
org-link-doi-open :export org-link-doi-export)
                       ("file+sys") ("file+emacs") ("shell" :follow
org-link--open-shell)
                       ("news" :follow #[514 "\301\300\302Q\"\207" ["news"
browse-url ":"] 6 "\n\n(fn URL ARG)"])
                       ("mailto" :follow #[514 "\301\300\302Q\"\207"
["mailto" browse-url ":"] 6 "\n\n(fn URL ARG)"])
                       ("https" :follow #[514 "\301\300\302Q\"\207"
["https" browse-url ":"] 6 "\n\n(fn URL ARG)"])
                       ("http" :follow #[514 "\301\300\302Q\"\207" ["http"
browse-url ":"] 6 "\n\n(fn URL ARG)"])
                       ("ftp" :follow #[514 "\301\300\302Q\"\207" ["ftp"
browse-url ":"] 6 "\n\n(fn URL ARG)"])
                       ("help" :follow org-link--open-help :store
org-link--store-help)
                       ("file" :complete org-link-complete-file) ("elisp"
:follow org-link--open-elisp))
 org-metaup-hook '(org-babel-load-in-session-maybe)
 )


-- 
+---------------------------------------------------------------+
| Derek Chen-Becker                                             |
| GPG Key available at https://keybase.io/dchenbecker and       |
| https://pgp.mit.edu/pks/lookup?search=derek%40chen-becker.org |
| Fngrprnt: EB8A 6480 F0A3 C8EB C1E7  7F42 AFC5 AFEE 96E4 6ACC  |
+---------------------------------------------------------------+