I hear ya. And I think you run into other limitations first. But length of runway probably not one of them. You’d have more engine power, so your thrust would scale up probaly faster than air resistance so you could get up to speed nearly as fast. And the relative air lift effect would go up with increased size because the air physics isn’t changing just because the plane is larger. Of course you’d also have structural problems with something that size and the required weight increases so it doesn’t fall apart would be a problem. But I say we build it anyway!!!