hi,im plainning to visit huangshan on june 9-june 12 ,,, if we arrive there how long can we stay inside the mountain??

and how much ticket per one person for visiting? is there any kind of camping ?? we will stay close to tunxi ancient street,if we take bus to get there do the buses have the exactly time to get back to the city ? or they always stay there?? also is it easy to find taxi there to get back to city?? plz give me some suggestion thx u :)