The spread of your writing can be important to focus and consistency in my opinion, so yes it may help in making you more punctual should that be your desire. It's a matter of preference though, in terms of wether or not the writing be done over time intervals or all at once. What's important is that you remain comfortable and interested throughout.
Once again however, I do not have any major qualms with waiting if you are having trouble with timing. So don't fret.