Time period for reviewing i864 at the embassy

[SrilankanstoUS 11]

Hello guys!! I have a quick question regarding my case. After the interview on Sep 10th I was told to submit additional documents(relationship evidence & petitioner's i864 with a joint sponsor) so after almost a month later on 6th October, i was informed by the embassy that the Consular Officer was done reviewing all the documents submitted but he was requesting a new joint sponsor instead of the previous one. So I submitted all the financial documents of a new joint sponsor on last 15th Oct and received a reply from the embassy that they received the documents and that they have submitted my file to the CO with the updated documents. My question is how long does the Consular Officers usually take to review a new i864 of a joint sponsor who has combined their household income with the spouse to meet the income requirement along with a i864A? There's no "last case updated" yet since Oct 6th. Any response would be appreciated!!