It's the same as anything else. My password for this forum might be Y}tz3Wd[^DkxY\2>5p$6. While it is theoretically possible someone could guess that on the first guess, in reality no one would ever be able to brute force that password.
Even if i think (and i know) that You are a Master, here, and you know the subject a lot better than me, i don't think it is really "the same".
Your password for this forum could be even a bit smaller, BUT i don't even know if you are using Uppercase or Numbers or Special, if you are using "real" words or as this case you are using random all togheter
A "secret phrase" is made by Words, and I (we) know the words, and I (we) know there are NO numbers, NO special characters, NO uppercase...
Yes, obviously is very hard to find but i think it is a good way to start the search.
Last thing... i don't think there are "money" inside your password, to push me a bruteforce that
