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There is no specific restriction on the amount of data that can be retrieved using QNetworkReply in Qt. However, the amount of data that can be transferred is limited by the network bandwidth and available resources on the client and server side. In addition, the response size can also be limited by server settings or configured timeouts. Therefore, it is important to handle the QNetworkReply data in a responsible and efficient manner to prevent issues such as memory exhaustion, network congestion, and connection timeouts.