Woah, I never saw that one.

And it says "over 1 month" sounds like a test badge.

I'd assume it's some sort of testing badge, given that it's unlisted, unattainable, and testing for 5-week badges would take too long

WAIT A MINUTE. I found the badge in a KA video.

https:// www . youtube . com /watch?v=FYMSOOJ_dwQ (remove spaces, idk if external links are allowed, timestamp 2:12)

Oh, the badge is retired.

Why does khan always retire badges. I could have had a ton by now!

They have done that in the past because there was a great migration from a code-language that makes the site, they had to do better programming in the site to allow more users to access during the pandemic, unfortunatelly they changed that, but they also made new ones, the site probably will keep changing in the future so don't be sad, like the new Maelstrom badge and future ones I hope so.