How long does it take for the second interview of China Railway Second Bureau?

I consulted the recruitment notice of China Railway Second Bureau, and I will inform the second interview about one week later.

China Railway Second Engineering Group is one of the world's top 500 enterprises and one of the world's top 500 brands. It is a central enterprise affiliated to China Railway Corporation. It has special qualifications for general contracting of railway projects and general contracting of housing construction projects, and enjoys the right to operate and trade with foreign countries.