It doesn't have to take that long. Grocery shopping aside, you should be able to prep a week's worth of "base food" in 2 hours or less, you just have to get the system going.
Here's a post I made in another thread about pre-cooking:
In 25 minutes you can chop a fridge full of veggies (I did a butternut, four peppers, a bag of mushrooms, 5 onions) and then supplement with bagged spinach or kale, bagged coleslaw (make your own dressing or cook the shredded coleslaw and use as a "noodle" base), the bagged brocoli from Costco & a bag of snow peas. Just before you start on the veggies, throw a dozen boneless skinless thighs on a greased cookie sheet into a 435F oven , throw some S&P, garlic and ginger powder at them bake them for 35 minutes. Once the veggies are done and bagged, put two frying pans on the stove and put 2# of ground beef in one and 2# of ground pork in the other. While those are sautéing, put a dozen eggs in a pot and start them hard boiling while you make a batch of immersion blender mayo and a batch of sunshine sauce. And when that's done, your chicken thighs & ground meats should be done.
So in about an hour you have about 6# of protein + a dozen eggs, two sauces and a fridge full of veggies and your "during the week" cooking should be nearly non existent.
You can also check out the following:
There are also lots of resources here on our forum about cooking in advance, a little google action will get you there, just google "Whole 30 meal prep" or "Whole30 advance cooking"