UA 3532 then BR 658 at O'Hare
Rochester (ROC) → Chicago → Toronto Pearson
Timetable, Chicago time
11:59UA 3532 from Rochester (ROC) at the gate
11:30BR 658 to Toronto Pearson leaves the gate
23 h 31 apart on the timetable, overnight
BR 658 leaves 23 h 31 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.