I'm taking off .3 seconds. I am making an allowance for the clock starting on the tip and going out of bounds. There is a threshold that you can be 100% certain that much time went off the clock without knowing how much actually went off. You just need to apply some common sense.
In most cases in what was described I would be 100% certain that .3 seconds as that number increases my certainty decreases.
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in OS I trust
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