As you can see, there are lots of variables to answering the how long is hamburger meat good for question. Raw hamburger meat (ground beef) is much more perishable than other cuts of beef and will keep in the refrigerator for only 1 to 2 days. Cooked hamburger meat will keep 3 to 4 days in the refrigerator.
Re: Poured side walk/steps, how long to leave forms? I strip the forms 24 hours later, but am careful not to damage the new concrete. It will still be very soft and with crumble if you put too much force on the edges. Usually concrete will harden withing 30 days to the point where it is considered cured.
The first 24 hours are very important. There should be no pets, children, adults, or anything on the concrete. After the first 48 hours, homeowners can walk on the fresh concrete. Skateboards, bicycles and any toys should be kept off the fresh concrete. In one week, it is okay for you to drive on your fresh concrete. You should try to stay away from the edges of the fresh concrete because the concrete in this area is weaker. In one month, the fresh concrete will have developed the proper strength and hardness.