Be prepared to fall back early Sunday morning, as people across the United States gain an hour of sleep with the end of daylight saving time. The switch happens Nov. 6 at 2 a.m. local daylight time.
To maximize the shelf life of cooked ground beef for safety and quality, refrigerate the ground beef in shallow airtight containers or wrap tightly with heavy-duty aluminum foil or plastic wrap. Properly stored, cooked ground beef will last for 3 to 4 days in the refrigerator. To further extend the shelf life of cooked ground beef, freeze it; freeze in covered airtight containers or heavy-duty freezer bags, or wrap tightly with heavy-duty aluminum foil or freezer wrap.
24 hours is fine. I've left ground beef in the fridge for about 2 or 3 days and it was still good. Raw meat should be kept at 40deg or lower and 3-4days is the standard. To prolong.......salt and spices and marinate it in a high salt marinate.....like steak sauces or soy sauce.