DE 4323 then DE 1668 at Frankfurt
Barcelona → Frankfurt am Main → Heraklion
Timetable, Frankfurt am Main time
12:20DE 4323 from Barcelona at the gate
09:40DE 1668 to Heraklion leaves the gate
21 h 20 apart on the timetable, overnight
DE 1668 leaves 21 h 20 after DE 4323 arrives on the timetable: more than half a day, so not a connection we count.