public function renewPriceUpdateTime()
    {
        $iTimeToUpdate = $this->fetchNextUpdateTime();

        // next day?
        $iCurrUpdateTime = \OxidEsales\Eshop\Core\Registry::getUtilsDate()->getTime();
        $iNextUpdateTime = $iCurrUpdateTime + 3600 * 24;

        // renew next update time
        if (!$iTimeToUpdate || $iTimeToUpdate > $iNextUpdateTime) {
            $iTimeToUpdate = $iNextUpdateTime;
        }

        \OxidEsales\Eshop\Core\Registry::getConfig()->saveShopConfVar("num", "iTimeToUpdatePrices", $iTimeToUpdate);

        return $iTimeToUpdate;
    }