UA 3994 then UA 3263 at Houston
El Paso → Houston → Richmond
Timetable, Houston time
11:04UA 3994 from El Paso at the gate
07:00UA 3263 to Richmond leaves the gate
19 h 56 apart on the timetable, overnight
UA 3263 leaves 19 h 56 after UA 3994 arrives on the timetable: more than half a day, so not a connection we count.