Mike Ounsworth here (author of the thread you're referencing)
This is a great excuse to do some back-of-the-envelope math! The factor to think about here is that when you're getting to numbers like 243, you have to start factoring in the number of hard drives, CPUs, and electricity required to store and use that data.
To make math easy, let's say each of those 243 password is stored as a SHA-1 hash (as is the case with the HIBP database). Each SHA-1 value is 160 bits, or 20 bytes. 243 * 20 bytes = 176 terabytes. Larger than my laptop, but chump change for a cloud service.
Going the other direction, imagine you have a database of all 243 plaintext passwords. You get your hands on the hash of an admin's password and you want to brute-force it against your database. Let's take the simplest and most insecure case; it's an unsalted SHA-256 hash. This is the problem that bitcoin mining rigs were built for baby! Let's take this bitcoin miner as a rough benchmark: $3,000 USD, 50TH/s (tera-hash per second), and consumes 1975 W.
According to my hasty math, one of those units would take
2^43 / (50,000,000,000,000 / s) = 0.2s to try all passwords, assuming that a database can feed 176 TB of data to it that quickly.
In reality, passwords are (well, should be) stored with salted PBKDF2 or Argon2. This changes the game considerably as these hash functions are intended to prevent this kind of attack. These hash functions can be tuned as slow as you want at the time that you store the password as a hash. Say you tune it to be ~ 0.1 s per hash. Now suddenly you're looking at numbers like "thousands of centuries", and "power consumption of the planet".
TL;DR: this is a great question to ask!
The answer is that if you're going to choose a password that you can remember and might collide with someone else on the internet, then your choice of password is less important than the site you're giving it to storing it securely.
IMHO, in choosing a password, you're not trying to prevent a dedicated enough attacker from ever cracking it; instead you're trying to make it hard enough that they'll go after a softer target. "I don't need to outrun a bear, I just need to outrun my friend".
If course, if you use a password manager with a completely random 32-char password, then you're getting into the cryptographic strength realm of "age of the universe", and "power output of a large star". So do that!