Bip39 Dictionary. First and foremost you need to keep it Individually from a seed. Owning your seed plus your passphrase in a similar locale defeats the purpose of using a passphrase to start with. No, there isn't a specialized limit for the size of your respective passphrase. Having said that, https://peakbookmarks.com/story19410247/bip39-wallets-https-linktr-ee-bip39-top-guidelines-of-bip39-words