Final Fantasy is known for creative and sometimes ridiculous bosses, so it should come as no surprise that the series features some rather long-winded boss battles.
Yiazmat from the twelfth game is one of the most recent of these famously long fights. This bad boy has an HP that is over 50 million -- sorry, not even a Vegeta 9000 joke can touch this. Out of all the bosses to grace the franchise, Yiazmat gets honorable mention because he holds the record for the most health out of any of the bosses - now that's serious.
Thanks to his out-of-this-world HP, the ability to administer sudden death hits and moves that petrify your character, Yiazmat takes gamers and average of 2-4 hours to defeat.