Only about a quarter of all background checks that take longer than three business days are completed within the 90-day deadline to determine if a sale should have occurred or not.

Everytown Research analysis of Federal Bureau of Investigation, NICS Operations Reports 2015–2019, https://bit.ly/36nWN6X. Between 2015 and 2019, 383,463 checks were delayed past three business days and resolved before the 90-day deadline, or an average of 76,693 checks every year.