Hiking times and 867 bus stop in Mutianyu.

Hi. Approximately how long does it take to hike between tower 16 (Cable car) and 6 (toboggan)?
Also, where does the 867 bus stop at the section? Is it near to the cable car? I'm planning on going there with my mate in July. Unfortunately the day we're going to the Great Wall will be on the weekend :(

Thanks