A3 303 then A3 734 at Athens
Heraklion → Athens → Tunis
Timetable, Athens time
09:00A3 303 from Heraklion at the gate
08:00A3 734 to Tunis leaves the gate
23 h apart on the timetable, overnight
A3 734 leaves 23 h after A3 303 arrives on the timetable: more than half a day, so not a connection we count.