“Adventures with Sarah” said a 2 hour delay at AMS. Also writes in her Substack:

“What to do if you end up in a huge immigration line? If you’re stuck in a line and about to miss your connection, you just need to let the airport staff know. They prioritize passengers that are on a tight schedule. The best advice is to plan for a longer connection time from here on out.”

I have a 3 hour connection at FRA in January. Hope that’s long enough. Stopping at a couple Ports in Spain next month. Doubt they’ll be set up to do fingerprints, etc.