CA 1246 then CA 1349 at Beijing
Hotan → Beijing → Changsha
Timetable, Beijing time
23:55CA 1246 from Hotan at the gate
19:45CA 1349 to Changsha leaves the gate
19 h 50 apart on the timetable, overnight
CA 1349 leaves 19 h 50 after CA 1246 arrives on the timetable: more than half a day, so not a connection we count.