What is the schedule of the bus from Huangshan to Shanghai?

I have checked your Q&A page. There is a post from 2011 that says the times are only 07:10, 08:10, 08:40, 09:20, 10:20, 11:50, 13:40, 15:50, 16:20 and 16:00. No late bus available like 20:00 ???
From where do the Buses depart? HS railway station or from Tunxi?