Molds are surprisingly fast growing organisms. Soft cheeses like American can grow mold almost upon contact with mold spores. It is important to keep American cheese (and other soft cheeses) wrapped and sealed tightly. If you find mold on American cheese, it is not the end of the world though. Food safety sites note that cutting off the mold, one inch around and below the mold should be sufficient to remove it. Always be careful when cutting away mold to not let the knife touch it to prevent cross contamination.
about a week
Philadelphia cream cheese should not be left unrefrigerated for more than two hours to prevent spoilage and potential foodborne illness.
Untill it starts smellin bad.
food
Cottage cheese should not be left unrefrigerated for more than two hours, as it can spoil quickly at room temperature. If the ambient temperature exceeds 90°F (32°C), it should be consumed or refrigerated within one hour. To ensure safety and freshness, it's best to store cottage cheese in the refrigerator and consume it promptly after opening.
If it's still sealed up, overnight is safe. If it's been opened, I would through it out after a few hours.
It will depend upon the temperature of the room it was left out in. Once the cheese has been warm for more than an hour to an hour and a half. I would be quite cautious of eating the cheese. You might smell it to see if it still smells safe to eat.
Not long
No.
Milk can last unrefrigerated for about 2 hours before it spoils.
it depends on the humitity.
Refrigerated food can only go unrefrigerated for four hours.