Processing time for my viet spouse travelling with me

Hi gurus,
Would like to know the Processing time for hong kong visa
Hi, i just submitted all documents for my wife and pay the processing fee for applying hong kong entry permit to the china embassy in singapore.

Will be travelling with her from hcm city to hk and back to hcm city for a 4day trip.

May i know what will be the processing time?
Some people told me 4-6weeks because application has to send to hk immigration. Some tell me about 10 days including sending documents back and fro hk.

So in what situations they will and will not send to Hk immigration.
We are just doing a straight forward 3 night stay in Hk with hotel and air tix all furnished.
Only aprox 16 days before we depart.