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After you've written your comment and when you click reply you get the message:

> You're posting too fast. Please slow down. Thanks.

That sounds like the automatic limit. Maybe there's a manual one as well with the same message though.

The triggering of the limit is automatic, but being subjected to the limit is something the moderators can turn on per account.

If I make a new account it'll be free of the limit until dang gets upset again.