TWO HOURS is the MAXIMUM time perishable foods should be at room temperature (ONE HOUR at temperatures 90 degrees F and higher).
It's generally not safe to eat food that has been left out at room temperature for more than two hours. Bacteria can multiply quickly in the ``danger zone,'' which is between 40°F (4°C) and 140°F (60°C).
Food safety guidelines generally recommend that perishable foods should not be left out at room temperature for more than 2 hours. If the temperature is above 90°F (32°C), this time is reduced to just 1 hour. After 4 hours, the risk of foodborne illness increases significantly due to bacterial growth.
As the USDA notes in Keeping Food Safe During an Emergency, your refrigerator will keep food safe for up to 4 hours during a power outage. Keep the door closed as much as possible. Discard refrigerated perishable food such as meat, poultry, fish, eggs, and leftovers after 4 hours without power.
Any cold food held without refrigeration is safe for up to 6 hours, starting from the time it was removed from refrigeration at 40 degrees Fahrenheit and below. Check the temperature of cold foods every 2 hours and discard any cold food that reaches a temperature of 70 degrees Fahrenheit or higher.
The Two-Hour Rule
Cooked food can only stay in the temperature danger zone for so long before it becomes unsafe to eat. Havern explains: "The maximum amount of time perishable foods can [spend] in the danger zone is two hours. At two hours, the food must be consumed, stored correctly, or thrown away.
Food held between 5oC and 60oC for less than 2 hours can be used, sold or put back in the refrigerator to use later. Food held between 5oC and 60oC for 2-4 hours can still be used or sold, but can't be put back in the fridge. Food held between 5oC and 60oC for 4 hours or more must be thrown away.
Power Outages: During and After
The refrigerator will keep food cold for about 4 hours if it is unopened. A full freezer will keep the temperature for approximately 48 hours (24 hours if it is half full) if the door remains closed.
Leftovers can be kept for 3 to 4 days in the refrigerator. After that, the risk of food poisoning goes up. If you don't think you'll be able to eat leftovers within four days, freeze them right away. Frozen leftovers will stay safe for a long time.
Safety of Specific Food Products
Hard cheese, butter and margarine: Well packaged products should remain safe; if odors or mold develops, discard the items. Milk products and mayonnaise: Discard if held above 40ºF for more than 2 hours. This category includes milk, cream, yogurt, and soft cheeses.
Discard all perishable foods, such as meat, poultry, eggs, side dishes, or casseroles, left at room temperature longer than two hours; one hour in room temperatures above 90 °F. Once leftovers are stored safely, they will remain safe three to four days. For more information please visit Safe Handling of Takeout Food.
The time it takes food poisoning symptoms to start can vary. Illness often starts in about 1 to 3 days. But symptoms can start any time from 30 minutes to 3 weeks after eating contaminated food. The length of time depends on the type of bacteria or virus causing the illness.
How long can pizza safely sit out? Believe it or not, pizza can only be left out safely for two hours at room temperature. At higher temperatures, it's safe to be left out for just one hour.
TWO HOURS is the MAXIMUM time perishable foods should be at room temperature (ONE HOUR at temperatures 90 degrees F and higher). This INCLUDES the time they're on the table during your meal. Just ONE bacterium, doubling every 20 minutes, can grow to over 2,097,152 bacteria in 7 hours!
Bacteria grow most rapidly in the range of temperatures between 40 °F and 140 °F, doubling in number in as little as 20 minutes. This range of temperatures is often called the Danger Zone. Never leave food out of refrigeration over 2 hours.
Never leave ground beef or any perishable food out at room temperature for more than 2 hours — 1 hour at 90 degrees F and above.
When it comes to eating food you've left out overnight (for more than 2 hours), there's no way around it—that food is simply NOT safe to eat. So, please pay heed to these key points on why you should NEVER eat it: Hot foods must be kept hot and cold foods must be kept cold.
Bacteria can grow rapidly on food left out at room temperature for more than 2 hours. If food is left out in a room or outdoors where the temperature is 90 degrees F or hotter, food should be refrigerated or discarded within just 1 hour. Myth: When I microwave food, the microwaves kill the bacteria.
What happens to meat that's frozen too long? Food that is stored in a freezer at zero degrees will be safe to eat indefinitely.
Since the compressor has to work harder to maintain the temperature inside the fridge, it puts extra load and pressure. This leads to increased wear and tear on the compressor. This is potentially detrimental to the overall lifespan of the refrigerator leading to frequent breakdowns.
In the United States, fresh eggs sold in stores are required to be washed and refrigerated, and then need to stay refrigerated. If you raise hens in your backyard, freshly laid eggs can be kept at room temperature, but if you wash them, you should refrigerate them.
How long will milk/eggs last during a power outage? Milk, eggs, fish, meat and leftovers will last four hours in the refrigerator, as long as the door stays closed the entire time.
Refrigerate or freeze perishables right away.
Never allow meat, poultry, seafood, eggs, or produce or other foods that require refrigeration to sit at room temperature for more than two hours—one hour if the air temperature is above 90° F.
Food poisoning bacteria rapidly grows at temperatures between 5°C and 60°C (the temperature danger zone). Minimise the time that food is stored at these temperatures to keep food safe.
The 7 hour rule is a sales and marketing strategy introduced by Daniel Priestley in his book “Oversubscribed”. The core premise is that, it takes 7 hours of cumulative interaction time between a lead and a company to build the necessary trust, understanding and desire to want to buy your product or service.