Jan_J

For some wordpress themes it is very useful to limit comments to a certain amount of characters. WordPress does not offer such an ability therefore I wrote this small plugin to limit the length of the comments.
Based on: 
* <a href="http://yoast.com/wordpress/minimum-comment-length/" rel="nofollow ugc">Minimum Comment Length</a>.

Maximum Comment Length

Check the comment for a set maximum length and disapprove it if it's too long.

Pippin Williamson

Modifies the Empty Spam action in WordPress to process the spam deletion in batches, allowing you to delete thousands or even hundreds of thousands of spam comments at once without killing your server.
Have you found a bug or have a suggestion or improvement you’d like to submit? This plugin is available on <a href="https://github.com/pippinsplugins/batch-comment-spam-deletion" rel="nofollow ugc">Github</a> and pull requests are welcome!

Batch Comment Spam Deletion

Modifies the Empty Spam action in WordPress to process the spam deletion in batches instead of all at once.

Maximum Comment Length vs Batch Comment Spam Deletion