UA 565 then UA 5201 at O'Hare
Washington → Chicago → Milwaukee
Timetable, Chicago time
07:30UA 565 from Washington at the gate
20:00UA 5201 to Milwaukee leaves the gate
12 h 30 apart on the timetable
UA 5201 leaves 12 h 30 after UA 565 arrives on the timetable: more than half a day, so not a connection we count.