How to travel by public transport from Beijng Jade Hotel to terminal 2 of the Airport and how long?

You must refer to Jade Garden Hotel, right?
If yes, you can walk northeast around 780 yards, and arrive at Wangfujing Street (Family Imperial-Court Hotel) Station first. Then take airport shuttle bus line 13 directly. The ticket fare is CNY 24 per person. It takes around an hour in usual time.