UA 3236 then UA 4596 at Houston
Midland → Houston → Springfield
Timetable, Houston time
18:30UA 3236 from Midland at the gate
14:25UA 4596 to Springfield leaves the gate
19 h 55 apart on the timetable, overnight
UA 4596 leaves 19 h 55 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.