As far as I observed the search engines decide about the indexing considering the unique being of the given document. For instance if you write a 200 words long post and you have a very long blogroll block the robot may easily decide not to put your post into the main index since the difference can be very small when the time comes to compare the generated html codes.
Otherwise I belive generally the length of a certain article is in direct proportion to the value can be provided to the readers. So in my opinion writing longer and better articles which covers more detail about the subject worth the time, since may generate you nice amount of natural backlinks.
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