ZH 239 then TR 644 at Changi
Shenzhen → Singapore → Phuket
Timetable, Singapore time
12:30ZH 239 from Shenzhen at the gate
12:00TR 644 to Phuket leaves the gate
23 h 30 apart on the timetable, overnight
TR 644 leaves 23 h 30 after ZH 239 arrives on the timetable: more than half a day, so not a connection we count.