You clearly don't understand how large 3^^^3 is. If the number of people dust-specked enters consideration at all it is large enough to change the answer.

Now that I think about it the original problem doesn't even make sense. 3^^^3 is large enough that if we allow a dust speck every millisecond in the eye of a particular person to count as torture and assume a base rate of dust specks of one in a billion milliseconds we get billions of additional people tortured for 50 years (who would otherwise have been tortured for 50 years -1 millisecond, who are replaced by billions of people who would otherwise have been tortured for 50 years -2 milliseconds, and so on, down to people who would have gotten only one dust speck and now get two consecutive ones)