For myself, I find writing every day is the easiest way to make it a habit and keep my brain in my project.
When writers ask me how often they should write, I usually say, “every day if you can.” For myself, I find writing every day is the easiest way to make it a habit and keep my brain in my project. When I write only a few days a week, I can lose track of my story on the days off and then I find it extra hard to get back into the writing when I come back to it. This can throw off your momentum.