Hi! I'll visit Huangshan in september. We'll spend the night at the top of the mountain (hotel Paiyunlou) and left the mountain the day after.

I was thinking about taking the night train in Nanjing at 23.48 to go to Beijing. What are the bus schedule from go from HS Scenic Spot to Nanjing? And which bus do I have to take to arrive at Nanjing in time to get the night train?
Apart from it, how much time do I need to go down the mountain by feet from Paiyunlou hotel in order to arrive at the bus stop?
Thank you very much in advance