Hello all! So grateful for the infinite knowledge and experience found here. I am very confused looking at F4 visa processes and timelines. I'm a US citizen that came from Costa Rica on a fiance visa in 2014. My wife and I are working on my the F4 visa application process to request one of my sisters to come here. I have a few questions if anybody has experience or answers.
1. I see insane processing times, but USCIS says it is estimated to take 10 months on my portal after submitting the online application. I know this does not include the wait for an actual visa to become available. That timeline seems to really vary and be VERY long for F4. However, I was thinking about how Costa Rica has the diversity lottery visa there for the US and that CR is probably not a high immigration country. Does the issuance time depend on the country of the beneficiary?
2. When do I do the I-864 affidavit of support? It was not requested with the I-130. Do I just wait until they ask for it?
Thanks in advance!