You can get off at the University of Macau, take a free bus to the New Century Hotel, and you can reach the gateway, not because it is free, but because it is faster, about 20 minutes. There are many buses in Gongbei to the airport, the underground square in front of the pass, and the Zhongzhu Building. It takes about 90 minutes to get to Zhuhai airport by bus, and it is estimated that it will take 4-5 hours to prepare for customs clearance, boarding and waiting for the bus.