IB 345 then DL 5620 at Boston
Madrid → Boston → Cincinnati
Timetable, Boston time
17:40IB 345 from Madrid at the gate
17:00DL 5620 to Cincinnati leaves the gate
23 h 20 apart on the timetable, overnight
DL 5620 leaves 23 h 20 after IB 345 arrives on the timetable: more than half a day, so not a connection we count.