Source: U.S. Census Bureau
Release: Business Formation Statistics
A measure of delay between business application and formation, similar to https://fred.stlouisfed.org/series/DUR4QNSAIL. The difference is that the window for business formation is restricted to eight quarters, rather than four. The series span the same period as https://fred.stlouisfed.org/series/BF8QNSAIL.
U.S. Census Bureau, Average Duration (in Quarters) from Business Application to Formation within 8 Quarters for Illinois [DUR8QNSAIL], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/DUR8QNSAIL, May 27, 2020.