[NegativeK]

I remember reading Schneier's Applied Cryptography, where he mentioned Landauer's principle [1] and things like the entire energy output of our sun over an appreciable amount of time. If you play with it, you end up realizing that a 50 character line noise password is absolutely insane overkill (assuming you didn't realize that from other, unrelated directions.)

Cryptography benefits from having a larger than practical keyspace due to what happens if the algorithm is weakened beyond brute force. But this happening isn't a given.

[1] https://en.wikipedia.org/wiki/Landauer%27s_principle