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People are usually better at estimating shorter amounts of time such as 10 or 15 seconds than 30 or 60 seconds because if a person is counting too fast or too slow a longer time such as 60sec, it allows them more time to go even faster or slower giving them a wider range of time to do so. So people that are better at estimating 10 seconds are not always good at estimating a longer time.But there are some that realises they are counting the wrong pace during the middle therefore counts more to the opposite pace( faster to slower/ slower to faster).
Normally when the first attempt of a person is over-estimated the second would be under as the person tries to count slower but the pace of counting might change during the middle so it won't always be the opposite of the first attempt. The same with underestimating on the first attempt.
Some people estimate time by saying a word of a specific length. But it depends on the speed that it's said because just saying it does not always give the same time because you could say it faster and slower.