UA 879 then UA 3234 at Houston
London → Houston → Silao
Timetable, Houston time
14:40UA 879 from London at the gate
09:15UA 3234 to Silao leaves the gate
18 h 35 apart on the timetable, overnight
UA 3234 leaves 18 h 35 after UA 879 arrives on the timetable: more than half a day, so not a connection we count.