I haven't been able to find any more details other than the "Purchase with a Large amount of credits", so..
How much and why?
I'm guessing 2 Billion because any more would be out of the reach of the average player.
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Gosh, I've been playing since it came out and I have maybe half that all in..
My guess would be closer to 5B, they might want you to really work for it and it doesn't have to be for the average player anyway. More an end game sort of thing.
If we want to extrapolate from something like an Anaconda it should probably be much more than that. What is the mass/volume of this relative to a ship like that - much much more. I ran some pretty random guess numbers and came up with a number more like 150B and that could still be conservative