UA 3772 then SQ 33 at San Francisco
Las Vegas → San Francisco → Singapore
Timetable, San Francisco time
22:05UA 3772 from Las Vegas at the gate
20:15SQ 33 to Singapore leaves the gate
22 h 10 apart on the timetable, overnight
SQ 33 leaves 22 h 10 after UA 3772 arrives on the timetable: more than half a day, so not a connection we count.