how much is the processing time for the visa to Hong Kong? I am a pakistani national residing in Dubai for more than 4 years.

You can apply for a HK visa through Chinese consulate in Dubai, in normal circumstances, processing time needed is within four weeks after the receipt of all necessary documents. If you want to shorten processing time, you can contact the consulate for details. As I know, application forms and supporting documents can be sent by Fax. However, and the original copy of the duly completed application form and the photographs required should be sent immediately to the Hong Kong Immigration by Airmail.