UA 3236 then UA 1632 at Houston
Midland → Houston → Guatemala City
Timetable, Houston time
18:30UA 3236 from Midland at the gate
12:40UA 1632 to Guatemala City leaves the gate
18 h 10 apart on the timetable, overnight
UA 1632 leaves 18 h 10 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.