> I downloaded the popular rockyou.txt wordlist and put my actual vault master plaintext password inside (using a quarter of the wordlist), otherwise it would take 6 hours+ to crack.

I don't believe the 6 hours+ claim. (Or rather, the "+" is doing some serious lifting in that sentence.)

Looking at the password, it's of the correct-horse-battery-staple variety, which could be conservatively estimated at 44 bits of entropy (this is even ignoring the additional number appended to a random word) - which would take even the described "multi-gpu" setup with 2 million hashes a second just about 100 days to exhaust (or 50 days to have a 50% chance of getting it), let alone the 1000 hashes a second macbook the author was using.