I do not think there is any rule on burst posting, it all depends on the quality of your post. If the quality is bad then you would be tagged for burst posting if not then there is no problem with it. I have seen a few times some Legendary members do it but the quality of their posts is above average. It does not affect them as they know how to reply to a topic.

Rather than asking a question like the one you did with this thread try to work on your replies. A good reply never gets wasted even if the reply was made within a few minutes. This is a forum, which means you are interacting with humans who have queries and who have solutions to those queries. Burst posting rules were applied by BMs to counter spam and they have been successful to an extent on countering spam.

There was a time when a lot of users of the forum would reply in one word being part of a campaign. A one-word reply if it is to the point would not be that bad but multiple replies on different threads is not welcomed. It will be considered a burst posting, to avoid it you would need to have some understanding about that topic. In a time when everything that is not understandable can be understood using your fingertip, it is better to be specific and detailed to avoid burst posting allegations.