Going to Song Cheng from Hangzhou Longxiangqiao?

Hi, I was wondering if the tourist bus Y4 is still operating?
What time is the last bus?
Would I miss that bus if I catch the last show at Song Cheng?

Heard that it is difficult to get a taxi after the show, how can I get back to Longxiangqiao station if the buses stop running? Any tips?