BR 715 then BR 381 at Taipei
Beijing → Taipei → Ho Chi Minh City
Timetable, Taipei time
23:00BR 715 from Beijing at the gate
19:30BR 381 to Ho Chi Minh City leaves the gate
20 h 30 apart on the timetable, overnight
BR 381 leaves 20 h 30 after BR 715 arrives on the timetable: more than half a day, so not a connection we count.