how long it will take to receive invitation letter from PRC

John, do you mean the letter from Duly Authorized Unit? Usually it takes about 15 working days to get it.

yes the letter and the permit that will enable me apply for the Z type here in my country
i was told to certify some few documents i have here after i certified it thru the embassy here i sent it back to my seniors in PRC she then told me she will move on with the next step but will like to know the steps for this process and also hoe long it will take after i have the documents certified and sent to her please?
thank you

John, she will then submit those documents to the relevant authorities to get the work permit and invitation letter for you. The whole process will take about 15 days.

thank you very much Leo i appreciate it