You really have a long time to do this, as I was just reading the other day that the application process is valid for something like a year, and if itu2019s going to take longer than that you just have to notify the government. I know in our case I did my wifeu2019s DS 260 form about a month after her I-130 was approved. Then it was another 3 months until I submitted her confirmation along with the Packet 3 documents.