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

get_derelicts.php

<?php
/**
 * Plugin Name: Abandoned WP Plugin
 * Plugin URI: https://gist.github.com/woodwardtw/cf706545a064a02fbd60
 * Description: This plugin finds abandoned WP site (by last update) on a WP MU installation and provides links to WP site and mailto
 * Version: 1.0.0
 * Author: Tom Woodward (og script), Jeff Everhart(plugin shell and implementation)
 * Author URI: https://gist.github.com/woodwardtw/cf706545a064a02fbd60
 * License: GPL2
 */


add_action( 'network_admin_menu', 'create_abandoned_menu' );

function create_abandoned_menu(){
	add_menu_page('Abandoned Sites', 'Abandoned Sites', 'manage_network', 'abandoned-sites', 'get_abandoned' ); 
}


function get_abandoned(){
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>';


};