J1 4805 then J1 4872 at Istanbul
Tehran → Istanbul → GBT
Timetable, Istanbul time
16:45J1 4805 from Tehran at the gate
11:00J1 4872 to GBT leaves the gate
18 h 15 apart on the timetable, overnight
J1 4872 leaves 18 h 15 after J1 4805 arrives on the timetable: more than half a day, so not a connection we count.