Make frequently needed ingredients, like broth, in quantity that can last for like 2 months. And the main meal can be cooked in quantity that can last for 2 weeks.
Cooking time also reduces drastically with this. For instance, to make average amount of chicken-rice recipe for your dog from scratch, you need about 2 hours. Having the chicken broth in storage will reduce cooking the main meal to less than 50% of the cooking time.
Set aside a portion of a day for making broth, then freeze it so you have broth worthy of 2 months to make you dog food. For instance, you can set aside a part of, may be, first Sunday of every bi-month to prepare your dog chicken broth.
Also, you can set aside a part of a day to make the main meal using part of the broth that will last for 2 weeks. Then store a 4-day’s worth of the food in the refrigerator and keep the rest in freezer.