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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 (might be different depending on your template)

<?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>

And your done! Of course, this is pretty easy to hack (you could just turn off javascript in your browser). If you really need to limit it legitimately you should probably do it server-side in the php.