Around 42 minutes to beat this boss. Quite a cheap boss since it can one hit kill you near the end of its health. It becomes completely invincible during this move preventing you from finishing off the final sliver of health and usually killing off whoever is still alive, since It will do this one hit kill move on all of your remaining characters. Still unsure how I prevented the attack from killing my last remaining character. I went for higher hits up by the chest, not too logical, feels very cheap. I tried doing heavy damage with the super moves which do MASSIVE damage, so I dont think it was a matter of not doing enough damage to interrupt the 1 hit kill move. No fuckin idea, but felt cheap. I do have a video of my playthrough of the Xbox 360 version. I scanned the video but didnt really study the final fight to see what needed to be done. The rest of the game is EXTREMELY easy.
Not super hard once you develop a decent strategy. Its mostly about finding the right roster of 3 characters to pull enough bullshit to get through. It just takes alot of trial and error to find the characters that pull the most bullshit. As usual I didnt look up the moves, as I dont often do that when beating fighting games. I have beaten all of the games in this series, multiple times for some, so I have some idea of how the games play. I dont know how to block some of the projectile attacks from this boss and his grab seems completely unavoidable. It easily kills whoever he grabs, so overall it feels very cheap. Not as bad as some of those SNK bosses though.