UA 3904 then BA 5608 at San Francisco
Portland (Oregon) → San Francisco → Los Angeles
Timetable, San Francisco time
07:53UA 3904 from Portland (Oregon) at the gate
07:00BA 5608 to Los Angeles leaves the gate
23 h 07 apart on the timetable, overnight
BA 5608 leaves 23 h 07 after UA 3904 arrives on the timetable: more than half a day, so not a connection we count.