The length of the answer depends upon the nature of the question. In the questions related to the jurisprudence , like quran , sunnah , qayas, ijtehad etc, three to five pages are more than sufficient . But in some of the personal law questions the quantity can also be reduced....

For example If the question is to write a note on "analogical deduction", you may write 6 pages . But if the question is to explain the "death bed transaction" then 3 pages will be sufficient.....

__________________
“You were born with wings. Why prefer to crawl through life?”