A3 638 then FR 6842 at Manchester
Athens → Manchester → Prague
Timetable, Manchester time
11:10A3 638 from Athens at the gate
08:25FR 6842 to Prague leaves the gate
21 h 15 apart on the timetable, overnight
FR 6842 leaves 21 h 15 after A3 638 arrives on the timetable: more than half a day, so not a connection we count.