I know I for one, want the Vault of Glass to be so hard that it takes me and my friends a good amount of time to complete. I like games that are so challenging that I get mad. I need the anger to fuel the fire. If I beat the so called " hardest thing we've ever built" within an hour or two, I'm gonna be pretty annoyed. But I trust in Bungie, I trust they'll make me cry.
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I heard they gave it to a group of really good gamers and thy took 15 hours to not even complete it