UA 2124 then BR 658 at O'Hare
Houston → Chicago → Toronto Pearson
Timetable, Chicago time
12:29UA 2124 from Houston at the gate
11:30BR 658 to Toronto Pearson leaves the gate
23 h 01 apart on the timetable, overnight
BR 658 leaves 23 h 01 after UA 2124 arrives on the timetable: more than half a day, so not a connection we count.