i am trying to send something like news letter Via Zend_Mail but after 12 mail i got this message

Fatal error: Maximum execution time of 30 seconds exceeded in C:\Program Files\Zend\Apache2\htdocs\forga\library\Zend\Mail\Protocol\Abstract.php on line 321

my Code is like:

$smtpHost = 'smtp.gmail.com';

$smtpConf = array( 'auth' => 'login',
'ssl' => 'tls',
'port' => '587',
'username' =>'[email protected]',
'password' => 'xxxxxxxx'
);
$transport = new Zend_Mail_Transport_Smtp($smtpHost, $smtpConf);

foreach($users as $user)
{
$mail = new Zend_Mail();
$mail->setFrom("[email protected]", 'Forga');
$mail->setSubject($subject);
if($html=='on')
$mail->setBodyHtml($message);
else
$mail->setBodyText($message);
$mail->addto($user);
$transport->send($mail);
}