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.
Keep animals off the driveway for at least another two days after people have started walking on it. This will keep untrimmed nails from digging any holes in the freshly dried surface; www.bossconstruction.com recommend waiting to drive a vehicle on new concrete for a minimum of three days after the concrete is poured. Remember that concrete takes a full month (28 days) to completely dry and hold its strength.