UA 4685 then CA 3104 at O'Hare
Duluth → Chicago → Shanghai
Timetable, Chicago time
17:05UA 4685 from Duluth at the gate
11:40CA 3104 to Shanghai leaves the gate
18 h 35 apart on the timetable, overnight
CA 3104 leaves 18 h 35 after UA 4685 arrives on the timetable: more than half a day, so not a connection we count.