As far as I understand it, these were not simple right/ wrong questions, but questions about estimating a continuous measure (height, age, percentages). I have

As far as I understand it, these were not simple right/ wrong questions, but questions about estimating a continuous measure (height, age, percentages). I have no reason to believe that questions were related or would give hints. Such a correlation would destroy the power of the experiment. As far as I understand it, this paper is not about "Do you know what is true or false in 20 seconds" but "what is a value you confidently estimate within 20 seconds". This is a field much studied in psychology and when you look into Kahnemann and associated research I would be surprised to find any scientific evidence that time improves your estimate. I'm not saying it's impossible, I am confident that - on average - it simply does not happen. Kahnemann showed we're full of biases and this research shows that calibrating ourselves with others is a much higher predictor of improving accuracy of estimations than time.