The answer
No. A longer recovery phrase can supply high entropy, but quantum threats to transaction authorization concern public-key signature schemes such as ECDSA and Schnorr. Seed length alone does not change the chain’s accepted signatures.
What to do next
Identify the transaction-signature algorithm actually accepted by the blockchain, not just the wallet backup length.
NIST post-quantum standards
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Trezor hardware wallet
A current-generation hardware wallet for managing keys; it does not make Bitcoin or Ethereum quantum-resistant or resolve a future protocol migration.
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Frequently asked questions
Would a 48-word backup solve the signature problem?
No. Increasing backup entropy is not equivalent to replacing a vulnerable signing algorithm.