Greetings,

The plugin limits the comments based on your choice. Per day, per week or per Month. Example, if you enter the comment limit of 20 and chose per day, the comments are limited to 20 per day and resets every 24 hours. Or you could chose 12 comments a week, etc.

If you import comments from another source, this plugin will not acknowledge any previous activity by each user. It is not suitable for unregistered comments, but as the description noted, this plugin is for membership systems or where a user is registered in WordPress and active as an approved users. A registration profile is required for the plugin to keep track of user activity.

Hope this helps!