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So, exactly when can we have declare an ATH to be?
Is it really subjected to any price that just broke the previous ATH even when we know it ain’t going to hold for long? Because we just might have way too many ATH in the previous!
It doesn't matter even if the price only lasts 1 minute or less, if the latest price passes the previous ATH, then it can be considered a new ATH. For example, currently the price of Bitcoin is around 66k USD, and the previous ATH was 73k USD, if the price of Bitcoin tomorrow is 74k USD or more than that, then that can be considered a new ATH for Bitcoin - because what matters is not how long the price lasts , but how the latest price is more than the previous ATH.