Limit the number of characters allowed in the post/page title field.
<?php
function ccd_limit_title_chars() { ?>
<!-- Change maxLength number to desired limit -->
<script>jQuery( 'input#title' ).attr( 'maxlength', 36 );</script>
<?php }
add_action( 'admin_footer', 'ccd_limit_title_chars' );
?>
WordPress Snippet