24 word passphrase The standard 24-word recovery phrase uses words from the BIP39 word list. One of these 24 word phrases has a total of 115,792,089,237,316,195,423,570,985,008,687,907,853,269,984,665,640,564,039,457,584,007,913,129,639,936 possible combinations.

Useful articles on the subject Why we need wide adoption of social recovery wallets – Vitalik Buterin https://vitalik.ca/general/2021/01/11/recovery.html