BA 8341 then SQ 33 at San Francisco
New York JFK → San Francisco → Singapore
Timetable, San Francisco time
23:54BA 8341 from New York JFK at the gate
20:15SQ 33 to Singapore leaves the gate
20 h 21 apart on the timetable, overnight
SQ 33 leaves 20 h 21 after BA 8341 arrives on the timetable: more than half a day, so not a connection we count.