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1/grahams number would be vastly smaller than a Planck length, which is supposedly the shortest/smallest distance that has any meaning (about 10^20 the size of a proton), so I guess font size couldn't be less than 1 Planck length. And there aren't anywhere near enough Planck units in the entire universe (around 10^186) to make a scratch on grahams number.
But if grahams number is that big, imagine what grahams number raised to the power of grahams number might be?? Then imagine this  there are still an INFINITY of numbers even larger than that!