Spring or autumn are ideal, especially early mornings to avoid crowds.

Open roughly 7:30 AM to 5:30 PM, with entry fees around ¥40-45 and additional costs for cable cars.

for planning a trip to the Mutianyu section (like hotels or transport)?

Totaling 21,196 km, it is a symbol of China constructed over more than 2,000 years.

Information on the mentioned in the search results?

Day trips from Beijing (1–1.5 hr drive) are common, using options like Bus 867/tourist shuttle or private drivers.