At the beginning of the page, put this
<?
include("includes/mysql.php");
$timeparts = explode(" ",microtime());
$starttime = $timeparts[1].substr($timeparts[0],1);
?>
at the bottom, put this before where you want to place teh message.
<?
$timeparts = explode(" ",microtime());
$endtime = $timeparts[1].substr($timeparts[0],1);
$total_length = $endtime-$starttime;
$total_length = round($total_length,6);
?>
Jee