I've taken the liberty of posting a link to the googlebooks pages for Sin Boldly! Dr. Dave's Guide to Writing the College Paper.
Scroll down to the section on pages 4-5 about format and length:
Hope this helps. In terms of our exam, I should think that the "content" essays ought to be somewhere in the ballpark of 3-5 pages each, whereas the critical evaluation essay about climate policy might go somewhat longer, say 5-8 pages. But again, your mileage may vary . . . "Long enough to reach the ground," as Abe Lincoln would say.