How much entropy is lost alphabetising your mnemonics?

Yes I know this is not BIP39 compliant and a horrible idea, but please help satisfy my curiosity with this thought experiment / maths exercise.

Two questions, one for 12 words, the other for 24.

Assuming "perfectly" random entropy to start, and the final checksum word adapted to the new order, likely not itself the last alphabetically.

Just how much entropy is lost re-sorting the words compared to the original random sort?

I don't need the "show your work" maths, more like practically speaking about current brute-forcing capabilities, "you would lose 70% of your entropy, and 40% respectively"

If not too inconvenient, something ELI5 like, how many years of effort difference?



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