TK 406 then T5 902 at Istanbul
St. Petersburg → Istanbul → Ashgabat
Timetable, Istanbul time
10:30TK 406 from St. Petersburg at the gate
09:45T5 902 to Ashgabat leaves the gate
23 h 15 apart on the timetable, overnight
T5 902 leaves 23 h 15 after TK 406 arrives on the timetable: more than half a day, so not a connection we count.