Can I turn off the stove mid-way through making the beef stock? I didn't know it would take 4 to 6 hours!
You can stop anytime you want really, but the end result is going to be vastly inferior. Beef stocks can easily go 7-8 hours and you will really notice the difference. If you are looking for a faster method, use an instant pot or pressure cooker, which will give you an 8 hour tasting stock in closer to 2-3 hours.