This is not an exaggeration.  Your download speed would slow down to the point where Windows would make this kind of absurd estimate, and you’d sigh and leave the room for a while (because you couldn’t use the computer while it was doing this for fear it would crash and lose all your progress) and then you’d come back in 40 minutes and maybe it would now say 52 years or maybe it would say 3 minutes, who knew, not Windows.