please tell me the daily time schedules for buses that go directly from Tangkou to Hangzhou

please tell me the daily time schedules for buses that go directly from Tangkou to Hangzhou and how long it take?
do you know how long it takes to descend Huangshan from Shilin hotel if I just take the cable car down?
I want to see if I can get down the mountain after trying to catch the sunrise and make make it back to Hangzhou for my 20:00 Flight out of Hangzhou. would it be better to charter a taxi? if yes do you know of any.
thank you for your advise