passphrase – 25th word / pasphrase security length

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I’m curious on how long this 25th word / passphrase should be to provide roughly the same level of security as the seed phrase.

Since the seedphrase is BIP 39 there’s a set amount of words you can pick from whereas with a passphrase it’s a bit different.

Basically, let’s assume somebody got ahold of a seed phrase but not the passphrase. What would be a good password length to ensure they couldn’t brute force it within reasonable amount of time



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