You in the far north or south of Konya side or planning to heavily irrigate? Seems Iona is too try for durian. For seedling durian 30ft or more should be considered. Just plant mid term crops in between like papayas, bananas, grafted white sapote or jackfruit etc and remove them in ten years for the durian to take up the area.
Imo the #1 mistake is planting too close, too close to buildings, and other plants. 10 meters is what we plant durians at and 20 meters between rows.