Jawazaat office (Riyadh)

Dear all Expats from Riyadh!

I am Vivian and I am from Vietnam.I am going to come to KSA in a week time for visiting purpose.

My visa is 30 days visit visa and I am wondering if I can extend it? As I know there is a place called Jawazaat office where I can go to ask for extension,right?

Could you all please give me the instruction about its office address? I have no idea about this.

and please tell me how many times maximum can i extend for my visa?

Thank you all very much in advance! I am welcoming all your inputs!

murrabah on king fahad road