It’s actually not that much work. My fave is a slow roast lamb (shoulder or leg), you brown the meat on the hob, then add an onion (in two halves), lots of garlic, a carrot (I snap mine in two) and a big bunch of rosemary. Salt and pepper. Put the lamb on top of these with its skin at the top, pour in some wine or water, cover with foil and cook for many hours at a low temperature like gas 2.
Then the veg gets cooked the hour before you want to eat, you take the meat out and turn the oven up high to cook your roast potatoes and obviously green veg only takes a few minutes. It’s a meal that’s quite suited to pottering and just doing a bit of cooking now and then through the day or the two-three hours before you eat, depending what joint of meat you are using. And I always do mine for 6pm rather than lunchtime because otherwise it would feel a bit hectic.
Roast chicken similar to the lamb- I cook it on top of an onion to flavour and colour the gravy, and with herby, garlicky butter under the skin and herbs in the tin too- but gas 5 for less time (something like 20 minutes per pound plus 20 minutes, not sure of the metric because my mum taught me that one but they put it on the label in a supermarket).
Delia Smith, Nigella Lawson and Jamie Oliver all offer decent recipes for doing a roast. Delia breaks down the timings for a roast in her Winter Cookery book (published in the 90s, was gifted to me when I started uni!) but may also do so in her Complete Cookery Course book. She also teaches how to make gravy (again, not nearly as hard as you think until you do it).