When a villain or sequence declared a base/planet/dimension/someone's death to be in 5 minutes, it takes an unusually long time for said death/destruction to occur. This can occur anywhere, in anime, manga, comic books and movies and even video games tend to abuse this rule.
Show Example: Freeza in Dragon Ball Z states Namek will explode in 5 minutes.
- 20 episodes later* Planet explodes after Goku defeats Freeza.
Game Example: In Metroid Prime 2 Echoes, you managed to defeat Dark Samus roughly 30 seconds left. CUTSCENE shows the Dark Aether being destroyed AFTER you defeat Dark Samus and Samus escaping before the dimension is destroyed.