about 4 hours and 38 minutes.

according to the Baidu map, the whole journey from Zhangjiakou to Ximeng is about 429.3 kilometers, and it takes about 4 hours and 38 minutes to drive by car, via Haizhang Expressway.

Ximeng food recommendation: roast whole sheep, milk tea, tray rice, cheese, braised pork, etc.