UA 3236 then UA 4280 at Houston
Midland → Houston → Lubbock
Timetable, Houston time
18:30UA 3236 from Midland at the gate
14:21UA 4280 to Lubbock leaves the gate
19 h 51 apart on the timetable, overnight
UA 4280 leaves 19 h 51 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.