LH 3515 then DE 1668 at Frankfurt
QDU → Frankfurt am Main → Heraklion
Timetable, Frankfurt am Main time
12:39LH 3515 from QDU at the gate
09:40DE 1668 to Heraklion leaves the gate
21 h 01 apart on the timetable, overnight
DE 1668 leaves 21 h 01 after LH 3515 arrives on the timetable: more than half a day, so not a connection we count.