US Immigration from Pakistan

What will be the time duration of 'After Green Card to US citizenship/Naturalization' in both the cases given below:

1. A foreigner marrying a US citizen

2. A foreigner marrying a Green card holder

Is Islamabad US embassy conducting fianc visa interview?

is NVC transferring cases to US embassy Islamabad?

I am posting on behalf of my in laws. I am interested to find out that how long is the office taking to schedule interview appointment?

filed n-400 applicaton: September 8,2019

Received biometric letter on Dec 31,2020: biometric scheduled on January 29,2021

Hello everyone!

I am US citizen and have applied for my father. His case is approved and every thing has completed on september 2020. Since then we are waiting for his interview letter but nothing has come yet.
I called NVC and asked them. They told they have everything. They dont want any thing else. Its just they have to sent my father s interview letter. I am waiting for that since 2020.
I want to know that does someone else here waiting for their parents interview letter? Or how long they take to send the letter?

Please if anyone know reply me!

Thanks

So this part is confusing to me.

For Tax Year 2019, I (USC) filed as single. However, on the I-944 application, it asks my spouse if "you or household member file a federal tax return?" After ticking yes for that, they ask her total income from tax return. She has not earned anything in 2019 nor in 2020 so the answer would be $0 correct? Or would we leave it blank for her and only put a value for me?