The Jasmer Challenge is for cachers to find a cache hidden in every month since geocaching began, in May 2000. As of January 2023, that's 273 months. While you can find caches hidden in all but ten of those months in the Chicago area, you may have to seek those caches out, and search for them in out of the way places. And when you do qualify for the Jasmer Challenge, when the first day of a new month rolls around, you no longer qualify until you find a cache hidden in the new month!
Jasmer's are hard. So this is an easy version. For this mini version of the challenge you need to find caches in 120 different months - that's ten years. The months don't need to be part of a continous streak - any 120 months count.
I qualify for this challenge with 273 months found, as of January 2023.