Arriving 7.00am on Sunday and departing 1.15pm on Wednesday

I will be arriving in Shanghai from Australia at 7.00 on Sunday morning and departing for Frankfurt at 1.15 on Wednesday afternoon - a total stay in Shanghai of approximately 78 hours. I will be staying with friends in Shanghai. I understand that I will not require a visa but that I will need to register with the local police station. Is that all that I need to do?