You know this intuitively. If each day you have to do the same task(s), figuring out the best time of day, time frame and way to do those tasks will help you be more productive. The more you get done, likely the less stress you will have, which is good for you and everyone you deal with.
For instance, when I first get into my office each morning I address my email inbox to determine who I need to respond to, what projects I need to work on and go about adding these items to my to do list. I do this before starting any project and before getting on the phone because if I wait until later in the day, my email tends to get out of hand and matters I should be dealing with may roll into the next day. When that happens, I am not as responsive as I want to be and reflects badly on me and my firm. That clearly is not something I want happening.
Of course you have to be able to bend your routine at times. Sometimes I have something on my calendar or an emergency situation for a client and I have to alter my routine. In doing so, I always know that I am going to have to deal with it later, which can mean, in my case, continuing to work through email that evening or early the next morning while still at home. I highly value work-life balance, but I also value my sanity upon arriving at the office in the morning…
You may not deal with a high level of email in your business, but there are other tasks that certainly can be put into the category or routine or repetitive. Think about how you deal with these. Is it the same each day? If not, be honest with yourself about whether the way you deal with it wastes time and makes you less productive.
I suggest picking one task to turn into a routine. Try for four weeks and see how it goes. This will take discipline and focus. If you can create a routine for and stick with it for even one repetitive task, it will help you and your business.