public static function prolong($name, $lifetime)
    {
        $item = static::reach($name);

        if ($item['lifetime'] > 0) {
            $item['lifetime'] += $lifetime;
        } elseif ($item['lifetime'] == 0) {
            $item['lifetime'] = time() + $lifetime;
        }

        static::$register[$name] = $item;

        static::save();

        return true;
    }