not long at all. like with any meat, if it's out of refrigeration for long periods of time it will spoil. the climate where you are can also affect how long it can go without refrigeration. If you made roast beef for Sandwiches down at the beach, it should be fine for the drive down (though I'd put it in a cooler to be on the safe side). If you live in a really warm, humid area, the roast beef'll probably go bad in a matter of hours if not refrigerated.
Assuming the refrigerated food is stored at 40 degrees F, a cooked roast beef should last for 3 to 4 days. http://www.cfsan.fda.gov/~dms/fttstore.html
how do I reheat a 16 rib crown pork roast that was cooked Christmas Day yesterday and only 2 ribs were eaten?
Cook time on 6.5 rib roast
A standing rib roast is a cut of beef that contains at least two ribs. This type of roast is cooked standing up on its rib bones.
No.
A prime rib can be frozen, but it should be thouroughly thawed before cooking.
A rib eye steak comes from the rib eye roast. The roast is generally 3-6 ribs, where the rib roast comes from ribs 6-12 on the steer. A slice of the roast, generally half and inch to two inches thick, is a rib steak. The rib steak may come with or without the bone.
No, a standing rib roast, also known as prime rib, is a much better cut of meat and comes from an area just to the rear of the cross rib roast, also known as English roast. The cross rib roast is from the cut of beef known as "chuck", which is from the top of the forelimb, near where it meets the shoulder blades. The standing rib roast comes from the area of the ribs where they meet the rib cage (above the area of the rib cage where the "short plate" cut is). They really are not the same, and do not cook the same way. The cross rib roast is best braised, whereas the standing rib roast is best roasted. You should see a difference in the price, with cross rib roast being less expensive than standing rib roast.
No.
Rib-eye roast
depends on the roast.
1.5 hours
There's a big difference between a rib eye roast and a standing rib roast. A rib eye roast is essentially a roast consisting of rib eye steaks. A standing rib roast is the same cut of meat as prime rib, only its "choice" not "prime" (like most of the meat we buy). If you are deciding which to purchase for your dinner, I would absolutely recommend the standing rib roast over the other. Standing rib roasts can be hard to find in the supermarket unless its a major holiday, Easter, Thanksgiving, Christmas, etc., most likely because they are being aged for those holidays, but especially if they have been aged, they have a flavor that just can't be beat.