Where can i find the bus timetable from Wuzhen to Hangzhou?

You can take a long-distance bus at WZ Bus Station. I found the timetable on the official website of the water town (Chinese version), but there seems no corresponding info on its English version.
Anyway, I can tell you that there are more than 30 buses from the town to Hangzhou every day. The earliest one is at 06:40 am. The last one is at 18:25 pm. And the frequency is about 20 mins.