EW 7520 then UA 991 at Barcelona
Hamburg → Barcelona → Washington
Timetable, Barcelona time
18:20EW 7520 from Hamburg at the gate
10:30UA 991 to Washington leaves the gate
16 h 10 apart on the timetable, overnight
UA 991 leaves 16 h 10 after EW 7520 arrives on the timetable: more than half a day, so not a connection we count.