UA 516 then QR 76 at O'Hare
Atlanta → Chicago → Milan
Timetable, Chicago time
16:50UA 516 from Atlanta at the gate
14:45QR 76 to Milan leaves the gate
21 h 55 apart on the timetable, overnight
QR 76 leaves 21 h 55 after UA 516 arrives on the timetable: more than half a day, so not a connection we count.