How can I get the Nigerian visa!? And how long I have to wait for

The visa is for 30 days and the usual wait is about 2 or 3 weeks

Are they not giving visa to us citizens again

I Actually got a visa for two years on my first try in 2021. I went to the OIS Office in Atlanta, Georgia and they gave me a list of things I needed. Once all documents were submitted, it took about 2-3 weeks for it to be returned to me by mail. Hope that helps!