UA 424 then QR 76 at O'Hare
Boise → Chicago → Milan
Timetable, Chicago time
17:05UA 424 from Boise at the gate
14:45QR 76 to Milan leaves the gate
21 h 40 apart on the timetable, overnight
QR 76 leaves 21 h 40 after UA 424 arrives on the timetable: more than half a day, so not a connection we count.