Shanghai City Longdistance Bus Terminal nearby Shanghai Railway Station. It needs three hours to Yixing and the earlies bus at 7am. The lastest bus from Yixing to Shanghai is at 15:00. So, pay attention to your time if you want to get back the same day. When you get to Yixing bus station from Shanghai, ask for the bus information for your return trip, and better to buy the ticket at the same time.