This is a somewhat glib but forty orders of magnitude, being a finite number, has no more to do with infinity that any other finite number. The nature of infinity is that you can’t get meaningfully closer to it.
> Arthur had a fairly clear idea of what infinity looked like.
>
> It wasn't infinity in fact. Infinity itself looks flat and uninteresting.
> Looking up into the night sky is looking into infinity - distance is
> incomprehensible and therefore meaningless. The chamber into
> which the aircar emerged was anything but infinite, it was just very
> very big, so that it gave the impression of infinity far better than
> infinity itself.