If you're asked a question such as "explain how businesses should deal with a consumer's complaint?", how long does your answer have to be?
well for a junior cert examination my teacher says that a question like that it should be about half of a copy page.
I think there's 2 factors which tell you how long a question should be
-The language of the question e.g "Name", "Mention", "Explain", "Define"
-The amount of marks going for it
I don't think you'd need to do very long answers. A few points should be fine
For a question like that it should really only take you a paragraph( 2-3 lines) to get your explanation across. You don't need to go off and write an essay. Look at the business marking scheme and you can get a good idea of how much marks are awarded to different questions.