FR 7595 then A3 992 at Athens
Budapest → Athens → Istanbul
Timetable, Athens time
00:30FR 7595 from Budapest at the gate
13:10A3 992 to Istanbul leaves the gate
12 h 40 apart on the timetable
A3 992 leaves 12 h 40 after FR 7595 arrives on the timetable: more than half a day, so not a connection we count.