I just set this up for npm, here's the command that worked for me:

npm config set min-release-age 7

The '7' is days. This is the only format that worked for me, just a single integer number of days.

Confirmed by trying to install the latest version of React 19.2.6 (published 5 days ago as of the time of this comment). It failed with a comment confirming that it could not find such a version published before a week ago.