A blog post should fulfill two main criteria.

It should be at least 450 words long, and it should completely answer all parts of the question, or in the case of separate questions, it should answer each question.

A good post should make a good will effort to explore the question in depth and not just "get the assignment done."

The number of points (out of 10) shall be awarded on the basis of completeness of answer, length and the relative quality of the response (regrettably, subject to my subjective determination).