With the rapid growth of the Internet, the 5 day waiting period expired on November 30, 1998, and was replaced by a criminal background check being passed by the National Instant Check System (NCIS). This process often only takes minutes, but can take up to 3 days. If the 3 days pass without a denial being issued, then the gun sale is allowed to occur. | With the rapid growth of the Internet, the 5 day waiting period expired on November 30, 1998, and was replaced by a criminal background check being passed by the National Instant Check System (NCIS). This process often only takes minutes, but can take up to 3 days. If the 3 days pass without a denial being issued, then the gun sale is allowed to occur. |