UA 571 then UA 29 at San Francisco
Atlanta → San Francisco → Singapore
Timetable, San Francisco time
11:24UA 571 from Atlanta at the gatealso VA 8403, NZ 9005
10:40UA 29 to Singapore leaves the gate
23 h 16 apart on the timetable, overnight
UA 29 leaves 23 h 16 after UA 571 arrives on the timetable: more than half a day, so not a connection we count.