In the words of a literary character, “Mischief managed.”
Managed to be smart and both warm up the oven AND the ground beef, and leave the other stuff set aside. With plenty of time to let the oven do its thing. The number one reason I’ve rarely made meatloaf I’m recent years, is it takes a good while to cook if you do it right. On work days that usually means an hour later than empty bellies want to wait.