Now that we have the new ISRC property (International Standard Recording Code) ...

Can someone propose a new property to capture the "length of sound recording' with a property ?  (if another property doesn't exist, from my cursory inspection, it does not exist)

See ISRC FAQ snippet below from https://www.usisrc.org/faqs/assignment.html

Q. When do changes in a recording merit a new ISRC?

A new ISRC must be issued when: