There is no set length for how long a 30 mark essay answer should be. However, in terms of content, the answer should include 3/4 main arguments. Within these 3/4 paragraphs there should be detailed analysis of each point, as well as evidence to back up everything you are saying. Additionally, you should try and make links between your points throughout, as well as evaluate your arguments, either throughout the essay or in the conclusion. Finally in the conclusion you should state a direct answer to the question and explain why you have come to this conclusion, referring to all of your previous arguments as well.