CN 7140 then CA 1845 at Beijing
Harbin → Beijing → Hefei
Timetable, Beijing time
22:30CN 7140 from Harbin at the gate
20:25CA 1845 to Hefei leaves the gate
21 h 55 apart on the timetable, overnight
CA 1845 leaves 21 h 55 after CN 7140 arrives on the timetable: more than half a day, so not a connection we count.