don't know if this will help but my english tutor told me:
1 mark questions should be done in 2.5mins, and should be 3 lines.
2 marks, 5mins, 6lines
3 marks, 7.5 mins, 1/2 page
5 marks, 12.5mins, 1 1/4 - 1 1/2pages
6 marks, 15 mins, 1 1/2 pages
all this obviously applies to english.