The trick for this case is a very long key, 1mb of more, try to recover all of them, you can lose about 60 bits, but not much more. What is the speed of extract

The trick for this case is a very long key, 1mb of more, try to recover all of them, you can lose about 60 bits, but not much more. What is the speed of extraction? You only need to delay it for a couple of decades.