TK 6887 then TK 1079 at Istanbul
Tbilisi → Istanbul → Belgrade
Timetable, Istanbul time
18:30TK 6887 from Tbilisi at the gate
14:55TK 1079 to Belgrade leaves the gate
20 h 25 apart on the timetable, overnight
TK 1079 leaves 20 h 25 after TK 6887 arrives on the timetable: more than half a day, so not a connection we count.