Honestly I don’t understand the whole NNN “challenge”. I feel like it would be harder to “nut” (hate that euphemism) every day without fail.
In a more literal way, I failed NNN already this morning by eating a peanut butter protein bar. Even if you don’t count buttered peanuts, it contained chunks of peanuts.
The disk is always encrypted. When data is accessed, it is stored decrypted in RAM. The drive doesn’t decrypt when unlocking it and doesn’t encrypt when turning it off.