UA 343 then OZ 6345 at San Francisco
Atlanta → San Francisco → Reno
Timetable, San Francisco time
20:07UA 343 from Atlanta at the gate
16:31OZ 6345 to Reno leaves the gate
20 h 24 apart on the timetable, overnight
OZ 6345 leaves 20 h 24 after UA 343 arrives on the timetable: more than half a day, so not a connection we count.