Isn't the answer milk first, then let sit? You only have 2 minutes, so if you're adding the milk after 2 minutes have already elapsed, then you've already exceeded the time limit, meaning the final measurement would take place before the milk is even poured in.
The bigger the temp difference the more cooling. So by putting the milk in right away you make the temp difference between the surroundings and the coffee smaller = less cooling over your 2 mins.
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