UA 1085 then UA 3907 at Houston
Mexico City → Houston → Washington
Timetable, Houston time
08:00UA 1085 from Mexico City at the gate
07:00UA 3907 to Washington leaves the gate
23 h apart on the timetable, overnight
UA 3907 leaves 23 h after UA 1085 arrives on the timetable: more than half a day, so not a connection we count.