Limit comment length in WordPress

limit-comment-length.php

<?php
// Limit the comment length to 6000 characters and a minimum of 50 characters in WordPress
add_filter( 'preprocess_comment', 'smartwp_limit_comment_length' );
function smartwp_limit_comment_length( $comment ) {
  
  // Limit the comments to 6000 characters
  if ( strlen( $comment['comment_content'] ) > 6000 ) {
    wp_die('Comment is too long. Comments must be under 6000 characters.');
  }
  
  // Require 50 characters to leave a comment
  if ( strlen( $comment['comment_content'] ) < 50 ) {
    wp_die('Comment is too short. Comments must be at least 50 characters.');
  }
  return $comment;
}