This is what the professor says…You should have no more than a paragraph or two per annotation.    Your introduction to the annotated should be brief (maybe a paragraph or two) and include your sources of research.  I’ve seen successful AB’s that are literally 11 paragraphs (intro and 10 annotations). Another bit of guidance that may help is to make sure you provide relevant analysis points on the annotations.  A high level overview of the article won’t do that but hitting multiple points that would interest business leader from a security PoV will hit the mark for the full points.