What is the time interval of Beijing airport shuttle bus line 2?

I am planning to take the airport shuttle bus #2 from my hotel back to the airport?

What is time interval between buses?

Where is the bus stop? Kindly provide me with the chinese name and address of the Xidan (Aviation Building).

My hotel is 北京西单美爵酒店, 北京市西城区宣武门内大街6号