A3 781 then LH 1281 at Athens
Zagreb → Athens → Frankfurt am Main
Timetable, Athens time
18:00A3 781 from Zagreb at the gate
14:30LH 1281 to Frankfurt am Main leaves the gate
20 h 30 apart on the timetable, overnight
LH 1281 leaves 20 h 30 after A3 781 arrives on the timetable: more than half a day, so not a connection we count.