How to Become a Fancy Waiter in Less than 20 Minutes is a book about what the name of it implies. It is only appeared in the episode, "Squilliam Returns."
there actually is a book with this title written by kelner Camarero
Its cover is made of a brown, leather-type substance, and is bound with golden straps around the spine/side. The titular writing has a similar style to most of the writing that one would expect from Bikini Bottom and no author is given.
Role in the episode
Squidward told SpongeBob to read the book to trick Squilliam Fancyson that the Krusty Krab was a 5-star restaurant. SpongeBob pledges to memorize it, "down to the punctuation marks," but finds it includes too much information for his brain to handle. He soon explodes and destroys the book.
By the width of the book, it should most likely take longer than 20 minutes to read this entire manual.