UA 3910 then UA 4565 at Houston
Washington → Houston → Little Rock
Timetable, Houston time
14:30UA 3910 from Washington at the gate
12:12UA 4565 to Little Rock leaves the gate
21 h 42 apart on the timetable, overnight
UA 4565 leaves 21 h 42 after UA 3910 arrives on the timetable: more than half a day, so not a connection we count.