LH 7913 then VA 8079 at San Francisco
Tucson → San Francisco → Houston
Timetable, San Francisco time
14:50LH 7913 from Tucson at the gate
12:00VA 8079 to Houston leaves the gate
21 h 10 apart on the timetable, overnight
VA 8079 leaves 21 h 10 after LH 7913 arrives on the timetable: more than half a day, so not a connection we count.