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Spamming is not only defined by intervals; you could be posting a lot of questions often which would not be considered spamming. Spamming could be posting something unconstructive, or gibberish, or even hate comments.

If you're asking about the filter which says “Woah, seems like you're commenting really quickly”, it doesn't care what you type, it could be spam or not, it's just there as a solution to prevent the kind of spamming you meant. I don't know how long you have to wait, but for scratchers it's like only a few seconds.