CA 946 then HU 7535 at Beijing
Karachi → Beijing → Changsha
Timetable, Beijing time
09:00CA 946 from Karachi at the gate
21:10HU 7535 to Changsha leaves the gate
12 h 10 apart on the timetable
HU 7535 leaves 12 h 10 after CA 946 arrives on the timetable: more than half a day, so not a connection we count.