A3 735 then A3 822 at Athens
Tunis → Athens → Berlin
Timetable, Athens time
18:45A3 735 from Tunis at the gate
16:25A3 822 to Berlin leaves the gate
21 h 40 apart on the timetable, overnight
A3 822 leaves 21 h 40 after A3 735 arrives on the timetable: more than half a day, so not a connection we count.