I mean, the way we used to live was pretty intense. Jesus Christ said that the Generation that saw him Ascend into Heaven, would likewise see him descend.

 Matthew 24. 

There's a battle victory every 300 years on Earth. 

In the Book of Revelation's, the Devil will enslave Mankind for 250-350 years before Christ overcomes him. Well, God & the Devil battle over Earth as Heaven's first Gate. Mankind is one of the first gates. Satan & the Kingdom of Hell need Earth to annex Heaven. 

So, there's a multi-century timeline & cosmic map of 250-300-350 years. 

Because then God & the Devil will have won or lost 1 battle.