Does it take 10 years to wait for US relative immigration from P2 to P3?

I guess it refers to the second notice to the third notice.

Under normal circumstances, after applying for brother or sister immigration, the first notification received is a receipt, the second is an approval letter, the third is a notification letter from the visa center for the upcoming date, and the fourth is Consulate interview notice. Due to the long immigration waiting time, siblings are the longest, usually taking more than ten years. Basically, the calculation starts from the receipt of the first notification receipt. Of course, if you don't get the second approval letter for more than ten years, it will be in vain.