public function getSumVisitsLengthPretty($idSite, $period, $date, $segment = false)
{
$formatter = new Formatter();
$table = $this->getSumVisitsLength($idSite, $period, $date, $segment);
if (is_object($table)) {
$table->filter('ColumnCallbackReplace', array('sum_visit_length', array($formatter, 'getPrettyTimeFromSeconds'), array(true)));
} else {
$table = $formatter->getPrettyTimeFromSeconds($table, true);
}
return $table;
}