Is it a certain time between each comment, depending on the activeness of the place, etc.?

Just wondering

There isn't a specific time for spam, though the time intervals for spam might range from 10 seconds to 1 hour, let's say. Spam can be considered anywhere, on (in)active accounts, (in)active studios and the forums.

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.

when green flag clicked
wait until <(time) = [11:30am]>
say [Lunch time!  Pizza time!!!]

If I posted on this thread with only the above script and nothing else, that would also be considered spamming, even if I only posted this one time. The reason is because the above script does not answer your question or contribute anything relevant to the discussion. So “spamming” doesn't always need to be something posted repeatedly.

Another example is those “chain mail” spam messages you probably see sometimes; the ones that are like “Hold your breath for 10 seconds, then say E three times, then copy and paste this comment to 10 projects for good luck,” or whatever kids are saying these days. Even if you post this sort of comment one time, it is still considered spam. Yet another example would be text art in a comment.

yeah this is true