Bip39 Checksum. Is there an English equivalent of Arabic "gowatra" - performing a task with none of the necessary teaching? No, there is not any technological Restrict on the duration of your passphrase. However, for that sake of memorability and practicality, it’s commonly advised to keep the passphrase somewhat shorter, https://webnowmedia.com/story4450840/bip39-wallet-https-linktr-ee-bip39-about-ian-coleman-bip39