Longest:
What not to say - Chrono & Serge
How to be a time-compression traveling, evil, magical slut that lives in a floating castle - Ultimecia
How all the other Cids made fun of me because I don't know anything about airships - Cid Kramer
How to write a self-help book - FF6 team

Shortest:
How to not care - Squall
How to look and act like a girl - Kuja
How to be spoony - Edward
The days I haven't sworn - Barret