How long do I need to make Visa China? what kind of document should I bring?

Elita, the entry permit for Hong Kong is not same as that for mainland, so you have to apply for one entry permit to enter mainland. However, I’m not sure whether you can apply from Hong Kong because you are not living there. Maybe you can hire an agent to apply for you. If possible, you had better go back to Indonesia to do the application.

In addition, as you hold an Indonesian passport, you can stay in HK freely for 30 days. You can try to get the mainland entry permit from Hong Kong, but not in one day. The quickest processing time is two working days. The documents should include your passport, a copy of the passport, an application form, a recent photo, and an invitation letter from a relevant person or organization in mainland.