How long does it take to complete my case?

If everything submitted to NVC is in order and the priority date is current, it usually takes the NVC about 30 days to get back to you with the next step which would be the consular interview date, again, if the priority date is current and all the documentation is in order.

Since your case is already at the NVC, the only things left to do before you are scheduled for an immigrant visa interview at the US consulate is to submit the affidavit of support form (I-864) and your civil documents to the NVC. I assume your case is at the NVC because you either entered the country illegally or are no longer in status. However, if you did enter the country legally and have just fallen out of status, your husband should apply for naturalization first and you can apply for adjustment of status on form I-485 after he becomes a US citizen. Otherwise, you will need to apply for a waiver if you have been unlawfully present in the US in excess of 6 months. Since your husband is only a LPR, you are not eligible to apply for a provisional waiver and can only apply for a waiver of unlawful presence after attending your interview at the consulate, which means you must remain outside of the US while the waiver application is being adjudicated.