Help: I-131 receipt from NSC

I need information about the I-131 receipt from NSC. I just received the copy of my I-131(concurrently filed I-140, I-485, I-765) from NSC. On my I-131 receipt, it says it usually takes 470 to 500 days to process this type of case. It is extremely long if it takes CIS 470-500 days to process I-131. Anybody has similar experience about I-131 receipt notice? I have family emergency need to go back China as soon as possible. Please help, any information is welcomed. Thanks in advance.