public function isExpired(DeliveryExecution $deliveryExecution)
    {
        $result = false;
        $executionState = $deliveryExecution->getState()->getUri();
        $lastTestTakersEvent = $this->getLastTestTakersEvent($deliveryExecution);

        if (in_array($executionState, [
                DeliveryExecutionState::STATE_AWAITING,
                DeliveryExecutionState::STATE_AUTHORIZED,
            ]) &&
            $lastTestTakersEvent)
        {
            /** @var \oat\taoProctoring\model\implementation\DeliveryExecutionStateService $deliveryExecutionStateService */
            $deliveryExecutionStateService = $this->getServiceLocator()->get(DeliveryExecutionStateService::SERVICE_ID);
            $delay = $deliveryExecutionStateService->getOption(DeliveryExecutionStateService::OPTION_CANCELLATION_DELAY);
            $lastTestEventTime = (new DateTimeImmutable())->setTimestamp($lastTestTakersEvent['created_at']);
            $result = ($lastTestEventTime->add(new DateInterval($delay)) < (new DateTimeImmutable()));
        }

        return $result;
    }