It is some 50 km from macau airport to Zhuhai airport by road. No first bus. You should take Macau airport bus (AP1) to Barrer Gate first pass the border custom and enter Zhuhai through Gongbei. At the Gongbei side, walk tem minutes to Zhongzhu Building. There are direct shuttle bus to Zhuhai Airport, 50 minutes. You can also take bus to Hengqin Custom from Macau Airport.There are shuttle bus at Hengqin to Zhuhai Airport too.