The Tang Empire's aircraft carrier fleet can only persist for another three days before returning to Linshui and Beiyuan for resupply.
Although the port on South Island is already operational, its biggest issue is that most of its throughput has been dedicated to "receiving" rather than "processing."
Various construction materials and personnel from the Tang Empire are being continuously transported to this island, with a constant influx of supplies every day, leaving no room for aircraft carriers to dock for resupply.
In fact, the same is true for New Island. Its limited logistical capacity is fully occupied with transporting supplies for the Orc army's logistical support, making it impossible to meet the demands of a large fleet.