UA 3236 then UA 4946 at Houston
Midland → Houston → Huntsville
Timetable, Houston time
18:30UA 3236 from Midland at the gate
14:40UA 4946 to Huntsville leaves the gate
20 h 10 apart on the timetable, overnight
UA 4946 leaves 20 h 10 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.