I have a multiple entry visa for China with a max stay of 30 days with each entry. I have to make and exit from China this 30th Dec and will be traveling to Hong Kong and then re-entering China. So I just want to ask is there any visa requirement for Hong Kong. There I will be staying only for 4 days. And will it be a problem to re-enter china after that. Or any kind of processing is required both in Hong Kong and in China. Please reply.