public function getFileTimeElapse($sourceFile)
    {
        $date = Mage::getModel('core/date');
        $timeZone = $this->getNewDateTimeZone();
        $startDate = $this->getNewDateTime(
            $date->gmtDate('Y-m-d H:i:s', $this->loadFile($sourceFile)->getCTime()),
            $timeZone
        );
        $interVal = $startDate->diff($this->getNewDateTime(
            $date->gmtDate('Y-m-d H:i:s', $this->getTime()),
            $timeZone
        ));
        return (
            ($interVal->y * 365 * 24 * 60) +
            ($interVal->m * 30 * 24 * 60) +
            ($interVal->d * 24 * 60) +
            ($interVal->h * 60) +
            $interVal->i
        );
    }