badaling great wall is how much far from beijing capital airport and how many times it will take ?

Sandip, I think you need to spend almost a day to have a trip to the wall. You may take airport express line to get off at Dongzhimen, change subway line 2 to reach Jishuitan station and then walk about 5 minutes to reach Deshengmen. There you can take no. 877 bus to reach Badaling. It takes 20 minutes (airport express line) + 20 minutes (subway line 2) + 5 minutes (by foot) + 1.5 hours (no.877 bus) on the way. So you may consider renting a car to finish this trip. It costs CNY 600 to 700.