Hi,
I read the documentation for the printPopularImages here
http://www.zenphoto.org/documentation/plugins/_zp-extensions---image_album_statistics.php.html#functionprintPopularImages

and it seem that there no option for printing the most popular images during the last 30 days. (it's a exemple)
I believe that it will be a great option to add.

Regards,
Laurent

PS : With my php knowledge i can't do that so if someone is interesting ...

New feature results should be made via the GitHub repository. https://github.com/zenphoto/zenphoto