CA 1900 then CA 1491 at Beijing
Nantong → Beijing → Zunyi
Timetable, Beijing time
14:00CA 1900 from Nantong at the gate
09:30CA 1491 to Zunyi leaves the gate
19 h 30 apart on the timetable, overnight
CA 1491 leaves 19 h 30 after CA 1900 arrives on the timetable: more than half a day, so not a connection we count.