F extension in Hong Kong.

Hi, regular service takes 4 working days including submission day. Expedited service is available if you need. For business F application, the Authorized Invation Letter, or an letter issued by the company you are employed and the registration license of this company, or an invitation letter from the mainland company and the registration license of the company is required.

Under some circumstances, you may be required to provide financial proof, a copy of hotel booking and return flight ticket booking.