Chicago used to have a K visa/other immigrant visa line, but that was a long time ago.
For K1 personal experience it took like 20 minutes. I would say it depends on the officer too. They do open the package, go through some stuff. but nothing major.
It depends on arrival time too.
Wow, that is a long wait time. When was your last time you entered through Chicago? Even on ESTA I never waited an hour, not even 30 minutes.
l am so glad to have global entry. Worth all the money even if I use it once a year. As a GC holder you can get TSA Pre + Global entry for a $100 that is available for 5 years.