wordpress multisite query to get the 50 blogs that have gone the longest without being updated

get_derelicts.php

<?php

global $wpdb;

$results = $wpdb->get_results( 'SELECT *  FROM wp_blogs ORDER BY last_updated ASC LIMIT 50', ARRAY_A);//change how many you want back here
//var_dump($results);

echo '<table>';
foreach ( $results as $site )
{

   echo '<tr><td>' . 
   get_blog_option( $site['blog_id'], "blogname") . 
   '</td><td> '  . $site['last_updated'] . 
   '</td><td><A HREF="' . get_blog_option( $site['blog_id'], "siteurl") .
   '">LINK</A></td><td><a href="mailto:'.get_blog_option( $site['blog_id'], "admin_email") .
   '?Subject=doom" target="_top">email '. get_blog_option( $site['blog_id'], "admin_email") .
   '</a></td></tr>';
}

echo '</table>';
?>