Blogger seems to have a limit of 4,096 characters. If that is not enough for your comment just break it into two or more submissions
Sometimes when you post a comment you get an error message "Request-URI Too Large." As far as we can tell this happens after your comment has been successfully posted and does not effect the posting of your comment. Refresh the comment page and if your comment send a copy to guy.westtsa@gmail.com and we will post it.