UA 3910 then UA 787 at Houston
Washington → Houston → Chicago
Timetable, Houston time
14:30UA 3910 from Washington at the gate
13:40UA 787 to Chicago leaves the gate
23 h 10 apart on the timetable, overnight
UA 787 leaves 23 h 10 after UA 3910 arrives on the timetable: more than half a day, so not a connection we count.