I'm going to stay at Capital Hotel Beijing, near Qianmen, how long does it take to go from airport?

The question was: how long does it take to go from Airport using Airport Express Train to Dongzhimen and metro to Chongwenmen? It's the best choice? We are two, and want to arrive as soon as possible, despite the cost. I read that taxi can take up to 2 hours.

Thank you!