They can go up to 10.4.infinity if they wanted to.
As someone who has a degree in Math, let me please ask you to be more careful what you say! "Infinity" cannot be used as a number! Apple can, however reach "Lim(n -> Infinity) 10.4.n"
Plus if you wanted to truly go beyond the scope of the human imagination, you would say 10.4.[Power Set of Infinity] or better yet, the Infinitieth Power Set of Infinity.
For those of you unfamiliar with the power set, let me describe it as such:
A Simple Infinity is, for example, the set of integers... (1, 2, 7, -14, 42, etc.) and there are an infinite number of them. These are also known as a "Countable Infinity" because, as the name suggests, you can count them. The Power Set of Infitity is almost like a deeper dimension of Infinity. This is akin to the set of real numbers... (Pi, e, -14, 10.4, etc.) but between any two real numbers exists infinitely many more real numbers. For this reason, there are uncountably many real numbers. The Power Set of the Power Set of Infinity would then be a 2-dimensional Real Number system, where two points are separated by infinitely many real numbers in the 'x' direction and the 'y' direction.
Carry on with this until you reach the infinitieth Power Set of Infinity and you've successfully blown the minds of any who attempt to comprehend its magnitude.
...Sorry...
I had to offset the Britney Spears comments somehow...
-Clive