Notifications by email every 7 days instead of 2

How can I change the frequency of notifications?

In version 1.84 I made these changes in:

Ow_plugins / notifications / cron.php

    public function fillSendQueue()

    {

        if ( $this->service->getSendQueueLength() == 0 )

        {

// Patri modif

//            $this->service->fillSendQueue(24 * 3600);

            $this->service->fillSendQueue(24 * 3600 * 7);

// End Patri modif

        }

    }

    public function run()

    {

// Patri modif

//        $users = $this->service->findUserIdListForSend(100);

        $users = $this->service->findUserIdListForSend(50);

// End Patri modif

        if ( empty($users) )

        {

            return;

        }

        $listEvent = new BASE_CLASS_EventCollector('notifications.send_list', array(

            'userIdList' => $users

        ));

        OW::getEventManager()->trigger($listEvent);

        $notifications = array();

        foreach ( $listEvent->getData() as $notification )

        {

            $itemEvent = new OW_Event('notifications.on_item_send', $notification, $notification['data']);

            OW::getEventManager()->trigger($itemEvent);

            $notification['data'] = $itemEvent->getData();

            $notifications[$notification['userId']][] = $notification;

        }

        foreach ( $notifications as $userId => $notificationList )

        {

            $this->service->sendPermittedNotifications($userId, $notificationList);

        }

    }

but it does not work. any ideas?

Activating debug and other mode is already done, but continue sending every other day.