Bip39 Passphrase. At first you'll want to keep it SEPARATELY from a seed. Acquiring your seed and also your passphrase in a similar locale defeats the purpose of having a passphrase to start with. No, there isn't a technological Restrict to the length of your passphrase. On the other hand, https://bookmarkbirth.com/story19837103/bip39-generator-https-linktr-ee-bip39-getting-my-bip39-wallets-to-work