If it were just up to me, I could survive on sandwiches or grilling some chicken and veggies on a grill 5x a week real quick, nbd. But I'm married, and my wife not only insists on hearty cooked meals (or takeout, which we already spend a ton of money on), but she's also not a big fan of leftovers.
Two meals for each of us per cooking "session" is our current norm (dinner, then lunch the next day), although I almost had to throw away leftovers last night because she wasn't in the mood to eat it for three days (I kind of forced it last night), but more than that and it's probably just going to be me eating it and still having to cook something else for dinner (or she spends money on takeout) anyway.