UA 6081 then VB 153 at Houston
Denver → Houston → Mexico City
Timetable, Houston time
10:30UA 6081 from Denver at the gate
10:05VB 153 to Mexico City leaves the gate
23 h 35 apart on the timetable, overnight
VB 153 leaves 23 h 35 after UA 6081 arrives on the timetable: more than half a day, so not a connection we count.