WordPress: How To Change Comment Excerpt Length

function my_get_comment_excerpt($comment_ID = 0, $num_words = 20) {
	$comment = get_comment( $comment_ID );
	$comment_text = strip_tags($comment->comment_content);
	$blah = explode(' ', $comment_text);
	if (count($blah) > $num_words) {
		$k = $num_words;
		$use_dotdotdot = 1;
	} else {
		$k = count($blah);
		$use_dotdotdot = 0;
	}
	$excerpt = '';
	for ($i=0; $i<$k; $i++) {
		$excerpt .= $blah[$i] . ' ';
	}
	$excerpt .= ($use_dotdotdot) ? '...' : '';
	return apply_filters('get_comment_excerpt', $excerpt);
}

<ul>
<?php 
	$comments = get_comments();
	foreach($comments as $c) :
?>
<li>
	<a href="<?php echo get_permalink($c->comment_post_ID); ?>">
		<?php /* output 10 words of comment */ ?>
		<p><?php echo my_get_comment_excerpt($c->comment_ID, 10); ?></p>		
		<span><?php echo $c->comment_author; ?></span>
		<span><?php echo date("m/j/Y",strtotime($c->comment_date)); ?> </span>
	</a>
</li>
<?php
	endforeach;
?>
</ul>