As you put together a writing schedule, be aware of what your time commitments really are. Comp papers are generally between 20 and 30 pages long, excluding references. Their length depends partly on what you expect to do with these papers. Writing three very short papers is against your best interests because they can be extremely valuable later on. See the next paragraph .
Comps serve several purposes.
First, they are the means to establish, for your committee, that you have a firm grasp of your research interests and the current trends in your field. Second, you'll hear that they should be of a publishable standard. If you have never published before, it may be wise to visit the library and spend a morning reading through journals. Find a journal whose approach and editorial style you like and make some copies. Look at the length and format.