UA 574 then CI 5345 at San Francisco
Boston → San Francisco → Taipei
Timetable, San Francisco time
12:49UA 574 from Boston at the gate
04:10CI 5345 to Taipei leaves the gate
15 h 21 apart on the timetable, overnight
CI 5345 leaves 15 h 21 after UA 574 arrives on the timetable: more than half a day, so not a connection we count.