org-effort-durations

org-effort-durations is a variable defined in `org.el'.
Its value is

(("h" . 60)
 ("d" . 480)
 ("w" . 2400)
 ("m" . 9600)
 ("y" . 96000))

Documentation:
Conversion factor to minutes for an effort modifier.

Each entry has the form (MODIFIER . MINUTES).

In an effort string, a number followed by MODIFIER is multiplied
by the specified number of MINUTES to obtain an effort in
minutes.

For example, if the value of this variable is (("hours" . 60)), then an
effort string "2hours" is equivalent to 120 minutes.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.