Go downstairs in Carlson, find a recent scholarly journal in your field and pay attention to the format of the articles in it.
Students in the Fall pilot version reported 10-15 hours spent on a typical project, including programming and writing. As can be seen in the sample projects, a 12-15 page project writeup is often appropriate.
There are many choices of high-quality resources! You're not helpless...
Bruce Nauman, 1988