Value of --pw-max must be smaller or equal to 32

[epixoip]

Just basic, elementary maths. Keyspace for this attack is 16^64. Fastest GPU (Titan X) can crack sha256 at 2.2 GH/s. This means you would need 1.6x10^54 Titan X GPUs to crack this password in one million years. And you're trying to do it with a single CPU.

Is that enough to convince you that it is impossible?