UA 436 then OZ 6315 at San Francisco
Pittsburgh → San Francisco → Washington
Timetable, San Francisco time
19:51UA 436 from Pittsburgh at the gatealso NZ 9396
16:52OZ 6315 to Washington leaves the gate
21 h 01 apart on the timetable, overnight
OZ 6315 leaves 21 h 01 after UA 436 arrives on the timetable: more than half a day, so not a connection we count.