UA 3236 then UA 1720 at Houston
Midland → Houston → Baltimore
Timetable, Houston time
18:30UA 3236 from Midland at the gate
12:20UA 1720 to Baltimore leaves the gate
17 h 50 apart on the timetable, overnight
UA 1720 leaves 17 h 50 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.