Cheat: Defeat The End Easily
Not many 60-90 minute boss fights are worth the time. Actually, scratch that no 60 minute boss fight is worth the time. One could argue that the duel against The End a rare exception.
If you are pressed for time, you can skip the fight altogether. First, enter The End's boss fight area. Save the game and go to the PlayStation 2's hardware settings. Advance the clock a few years, then launch Metal Gear Solid 3 using your save. Now you won't have to fight The End since he died of old age. What's up now, granpa?