UA 1702 then UA 3235 at Houston
San Francisco → Houston → Louisville
Timetable, Houston time
00:30UA 1702 from San Francisco at the gate
20:45UA 3235 to Louisville leaves the gate
20 h 15 apart on the timetable
UA 3235 leaves 20 h 15 after UA 1702 arrives on the timetable: more than half a day, so not a connection we count.