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Here's a quick way to limit the length of customer comments on your invoices using javascript. Essentially, this is just a script to limit the size of a <textarea> element.

in both includes/templates/YOUR_TEMPLATE/templates/tpl_checkout_shipping_default.php and includes/templates/YOUR_TEMPLATE/templates/tpl_checkout_payment_default.php

find this line

<?php echo zen_draw_textarea_field('comments', '45', '3'); ?>

and insert BENEATH it

Max 140 Characters (<div style="display:inline" id="charCount">140</div> remain)
<script>
comments = document.getElementsByName("comments")[0];
comments.onkeydown = commentstuff;
comments.onkeypress = commentstuff;
comments.onkeyup = commentstuff;
comments.onblur = commentstuff;
comments.onfocus = commentstuff;
comments.onclick = commentstuff;
comments.onselect = commentstuff;
function commentstuff(){
if (comments.value.length > 140)
    {
      comments.value = comments.value.substring(0, 140);
    }
  remain = 140 - comments.value.length;
  document.getElementById('charCount').innerHTML = remain;
}
  remain = 140 - comments.value.length;
  document.getElementById('charCount').innerHTML = remain;
</script>