Cooked food should be held at least 140 degrees. Food should be consumed as soon as possible after cooking to slow the growth of bacteria. This is what refrigeration does. Generally speaking most hot foods will not have excessive bacterial growth in less than two hours. However this is accounting that the food was at a proper temperature at the beginning of that time. Also, bacterial growth can be greatly increased due to other improper handling (i.e. introduction of filth from hands ect).
If it is in a unopened shelf stable can, at least a couple of years.
If you prepared it and have leftovers, then it should be refrigerated within about 2 hours.
Boiled potatoes could develop harmful mold even in a refrigerator, in a period of 3 weeks. That is a very long time to store boiled potatoes (unless frozen, which is safer). Three weeks at room temperature is far too long for boiled potatoes (although raw potatoes can last that long).
Sometimes, if the scene calls for it, but it may well not be what it looks like or what they say it is. For example, stage lights would quickly melt ice cream, so if a scene in a play calls for the actors to eat ice cream, the "ice cream" is most likely mashed potatoes instead. It takes some degree of acting skill to eat room temperature mashed potatoes and pretend it's ice cream.
at room temperature about 4 hours
Butter can last for days at room temperature. But it is not recommended to leave it out for that long.
Store potatoes in a cool (at least room temperature), dry, dark place. A pantry is ideal. Taking the potatoes out of their plastic bag and putting them in a paper one is advisable, given that this further protects them from light, and yet allows them to breathe.Under the above conditions, you can keep potatoes for about 2 weeks.However, potatoes can keep for longer -- 4 weeks or more -- if you keep them cooler than room temperature. 7 - 10 Celsius (45-50 Fahrenheit) is ideal.If the potatoes have started sprouting and softening a little, you can actually still eat them, as long as you remove the sprouts, peel the potato and cook it really well. (boiling them is best)As long as it's still white, and hasn't started smelling, they won't hurt you.
not too long
After an hour or so at room temperature, meat should be cooked.
Either it is at 390°C or at room temperature. It can't be both.
Yes, for several hours. A baked potato, especially if the skin is intact, is not likely to spoil at room temperature. OTOH, it would be wiser to refrigerate cooked potatoes to be completely safe.
I would estimate a two hour limit for keeping yogurt at room temperature. Personally, I take it out of the refrigerator and eat it immediately. I see no need to keep it at room temperature.
I have no idea at all what your question means. Take a piece of iron and put it in a room whose temperature is 32 degrees, and before long the iron's temperature will be 32 degrees. Put a piece of iron into a room that is at 105 degrees, and before long the iron's temperature will be 105 degrees.
The room temperature is...the room temperature !!