How hard is it to find out the correct seed phrase from a random ordered seed phrase?

I have two wallet, one with 12 words (hot wallet) and the other one has 24 words seed (ledger). I wrote the 36 words on a paper in a random order. And the correct ordering on a separate paper.

How hard would it be to someone to calculate the correct wallet from this randomized 36 words table?

I plan to store the words in separete houses and the order numbering also in different places.