It really depends where you want to go. If you go from Shanghai to Suzhou via HSR a train goes roughly every 15 minutes. Most trains going east go through Suzh

It really depends where you want to go. If you go from Shanghai to Suzhou via HSR a train goes roughly every 15 minutes. Most trains going east go through Suzhou (since it is a major hub) and it is roughly 30 minutes away which is a decent distance so worth stopping for. The train only gets to maximum speed for about 15 minutes in the middle.