UA 3752 then QF 3654 at San Francisco
Denver → San Francisco → New York JFK
Timetable, San Francisco time
13:00UA 3752 from Denver at the gate
07:00QF 3654 to New York JFK leaves the gate
18 h apart on the timetable, overnight
QF 3654 leaves 18 h after UA 3752 arrives on the timetable: more than half a day, so not a connection we count.