How long can I receive the case number package after my parents immigrated to the United States and submitted the 130 form?

Five to six months. According to the information of the National Visa Center, it takes five to six months to apply for immigration to the United States and submit the 130 form.

1. First submit the I- 130 application to the designated immigration office, and the immigration office will process it for about 5-6 months.

Secondly, I received the approval of I-797 and informed the Immigration Bureau to transfer the case to the National Visa Center (NVC).

Finally, NVC accepted the case and sent the payment bill.