For my human-facing passphrases, I taught my password generator to scale automatically based on the size of the password space, the capabilities of an expected attacker (default: Snowdon's "assume 1 trillion/sec"), and the length of time for an attack (default: a decade). Keeps it clear how strong or weak what I'm using should be:

    -% mkpass -h
    Usage: mkpass [options]
        -a, --attacker [RATE]            Assume an attacker capable of RATE guesses/second (default: 1000000000)
        -t, --time [DAYS]                Resist an attack for up to this many days (default: 3652)
        -b, --bits [BITS]                Generate a password with this many bits of entropy (default automatic)
        -l, --length [LENGTH]            Make LENGTH word/char passwords (default automatic)
        -n, --number [NUM]               Make NUM passwords (default 1)
        -w, --wordlist [FILE | name]     Use file as wordlist (default comm3000 3esl)
        -v, --verbose

    -% mkpass -v
    Complexity 22088^5, 72 bits of entropy.  1811 centuries at 1000000000 guesses/sec
    messy photo groceries stoke horse

    -% mkpass -vb 100
    Complexity 22088^7, 101 bits of entropy.  88357157 million years at 1000000000 guesses/sec
    ungainly shopping mall dissociation turf across stridden microphone

    -% mkpass -vl3
    Complexity 22088^3, 43 bits of entropy.  2 hours at 1000000000 guesses/sec
    Weak passphrases: estimate 43 bits of entropy. 50+ recommended (length=5)
    terrace lower-class paneling

    -% mkpass -vw pin
    Complexity 10^18, 59 bits of entropy.  34 years at 1000000000 guesses/sec
    366565907478491511

    -% mkpass -vw alnum
    Complexity 62^10, 59 bits of entropy.  28 years at 1000000000 guesses/sec
    cTDng2KioE