One region, several distinct valleys
Ili is not a single scenic stop. Sayram Lake, Xiata, Kurdining, Kalajun, Nalati and Qiongkushitai offer different combinations of lake, grassland, spruce forest, village access and hiking. Selecting two or three well-timed landscapes is usually better than driving through all of them.
Five days suits Sayram Lake plus one valley; seven to nine days supports a broader circuit and slower mornings. Flower and grass conditions shift by altitude and date.
Why Yining is the useful gateway
Starting in Yining protects the trip from two long transfers across from Urumqi. It also makes shorter private itineraries operationally credible and gives more room for weather changes in Xiata or the grassland areas.
Duku Highway is seasonal and must have a named fallback. The final service scope should state whether the route is driver-led, whether English guide days are included and how remote lodging is handled.