I typically do, although some dinners or lunches will have a component that is reheated (e.g., reheat some frozen braise from last weekend, but with fresh cooked veg and potatoes, say.)

If I'm in a hurry, there are lots of things I can make in 30 min or less. More often if I'm busy I'll make something that doesn't require much interaction; e.g. 10-15 min prep and 60 nearly untouched in a 500 degree oven for a roast chicken with root veg in one pan. I do other things in that hour.

Honestly, I've been doing this long enough I'm pretty efficient. I could save a little time buying more prepared food, but my meal quality would go way down so I don't mind. Shopping is pretty efficient too, as I mostly don't shop by recipe.

To be fair though, I find cooking relaxing as a way to wind down after work, so sometimes I'll do something more involved just for the hell of it on a random Wednesday.

also, what consists of three meals? the way I learned to cook (and most people I know) is you get a couple of ingredients for a dinner, and use the leftovers for lunch/dinner the next day. breakfast usually consists of something simple like bread + cheese or a kind of meat. (some people don't even eat breakfast and just start the day with a coffee or a glass of water).

I always made three meals a day even alone in a apartment. It's not difficult to make eggs or cook salmon

Hm I definitely do, for my whole family. I work at home, though