UA 3236 then UA 625 at Houston
Midland → Houston → Washington National
Timetable, Houston time
18:30UA 3236 from Midland at the gate
14:33UA 625 to Washington National leaves the gate
20 h 03 apart on the timetable, overnight
UA 625 leaves 20 h 03 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.