There are several updates, compatibility pack 8, 7, 6, and 5. All of my friends finished their downloads in just over 4 hours, and I was right there with them until I reached the last patch, which I just made a thread about. Long story short, the final patch for me is taking over 6 hours for that one patch alone. And it's not even a 2 gigabyte patch. I don't know what's going on here, but bungie must have derped the code I think.