UA 770 then QR 76 at O'Hare
Barcelona → Chicago → Milan
Timetable, Chicago time
18:00UA 770 from Barcelona at the gate
14:45QR 76 to Milan leaves the gate
20 h 45 apart on the timetable, overnight
QR 76 leaves 20 h 45 after UA 770 arrives on the timetable: more than half a day, so not a connection we count.