I highly recommend thinking of "writing" as distinct from "producing" or anything with your computer. Many a lesson I have had a very talented student come in and when I ask how they went with the writing assignment and out comes "XYZ crashed, had to rebuild template" or "I spend all my time trying out samples and sounds" For example, you can write a 32/64 measure composition that essentially looks like a lead sheet. Just melody. You can write one a day for a week. The next week, spend 2-3 days orchestrating them. Then the rest of the week with the computer. Your work flow will speed up considerably if you are writing orchestral music without synths etc. That said...... once you can "knock out" a bunch of pieces it is no longer going to be a stretch for you to continue, thus at that point you might decide to work on a bigger more detailed compositions. Beethoven took years to write some of his pieces.