B6 1034 then B6 561 at Boston
San Francisco → Boston → San Juan
Timetable, Boston time
20:59B6 1034 from San Francisco at the gate
20:16B6 561 to San Juan leaves the gate
23 h 17 apart on the timetable, overnight
B6 561 leaves 23 h 17 after B6 1034 arrives on the timetable: more than half a day, so not a connection we count.