HH 575 then TK 633 at Istanbul
Tashkent → Istanbul → Niamey
Timetable, Istanbul time
17:50HH 575 from Tashkent at the gate
14:00TK 633 to Niamey leaves the gate
20 h 10 apart on the timetable, overnight
TK 633 leaves 20 h 10 after HH 575 arrives on the timetable: more than half a day, so not a connection we count.