ZH 8904 then MF 8306 at Guangzhou
Zhengzhou → Guangzhou → Xiamen
Timetable, Guangzhou time
12:20ZH 8904 from Zhengzhou at the gate
10:10MF 8306 to Xiamen leaves the gate
21 h 50 apart on the timetable, overnight
MF 8306 leaves 21 h 50 after ZH 8904 arrives on the timetable: more than half a day, so not a connection we count.