Ground Beef that is raw and not cooked should easily keep for up to 3 days in the refrigerator without going bad.
Ground Beef should keep for up to 4 days in the refrigerator before it goes bad but I would not want to keep the ground beef that is raw in the refrigerator longer than 3 days.
If you want to keep the ground beef longer than 3 days it's best to freeze it to keep bacteria from growing on the ground beef and spoiling it.
The ground beef when spoiled and no longer safe to eat will have a bad odor and the ground beef will sometimes also get a slimy feeling to it and change color.
If it smells good though and is not slimy then the ground beef is usually safe to eat.
If it has a bad smell to the ground beef or a slimy feeling to the ground beef then throw it out.