UA 3901 then UA 2153 at San Francisco
Hong Kong → San Francisco → Redmond
Timetable, San Francisco time
16:34UA 3901 from Hong Kong at the gate
10:30UA 2153 to Redmond leaves the gate
17 h 56 apart on the timetable, overnight
UA 2153 leaves 17 h 56 after UA 3901 arrives on the timetable: more than half a day, so not a connection we count.