FR 7595 then TK 1848 at Athens
Budapest → Athens → Istanbul
Timetable, Athens time
00:30FR 7595 from Budapest at the gate
13:05TK 1848 to Istanbul leaves the gate
12 h 35 apart on the timetable
TK 1848 leaves 12 h 35 after FR 7595 arrives on the timetable: more than half a day, so not a connection we count.