DE 1809 then DE 1668 at Frankfurt
Olbia → Frankfurt am Main → Heraklion
Timetable, Frankfurt am Main time
11:35DE 1809 from Olbia at the gate
09:40DE 1668 to Heraklion leaves the gate
22 h 05 apart on the timetable, overnight
DE 1668 leaves 22 h 05 after DE 1809 arrives on the timetable: more than half a day, so not a connection we count.