UA 3236 then UA 6181 at Houston
Midland → Houston → Silao
Timetable, Houston time
18:30UA 3236 from Midland at the gate
12:23UA 6181 to Silao leaves the gate
17 h 53 apart on the timetable, overnight
UA 6181 leaves 17 h 53 after UA 3236 arrives on the timetable: more than half a day, so not a connection we count.