$mtime = microtime();
$mtime = explode(' ', $mtime);
$mtime = $mtime[1] + $mtime[0];
$starttime = $mtime;
// your system commands / work here
$mtime = microtime();
$mtime = explode(" ", $mtime);
$mtime = $mtime[1] + $mtime[0];
$endtime = $mtime;
$totaltime = ($endtime - $starttime);
//
// do some more stuff
//
$to = "me@whereiam.com";
$subject = "My Subject";
$body = "Process executed in " .$totaltime. " seconds.";
$header = "From: me @ whereiwas . com]\r\n";
$header .= "Return-Path: me @ whereiwas . com\r\n";
$header .= "Reply-To: me @ whereiwas . com\r\n";
$success = mail($to, $subject, $body, $header);
//
// email addresses with spaces added