CA 870 then CA 1589 at Beijing
Irkutsk → Beijing → Shanghai Hongqiao
Timetable, Beijing time
20:55CA 870 from Irkutsk at the gate
20:30CA 1589 to Shanghai Hongqiao leaves the gate
23 h 35 apart on the timetable, overnight
CA 1589 leaves 23 h 35 after CA 870 arrives on the timetable: more than half a day, so not a connection we count.