I would not risk using it.
Overnight, approximately 12 hours.
The general rule of thumb for food safety is no longer than 2 hours at room temperature, but a processd cheese would be ok for a couple of hours longer.
No food safety person would recommend that lasagna would be safe to eat after it was left out overnight. Throw it out. I would not recommend eating anything left out overnight that contains ANY form of dairy (this includes the ricotta cheese in the lasagna), meat, eggs, or anything that contains a single ingredient that should be stored in the refrigerator.
If it's still sealed up, overnight is safe. If it's been opened, I would through it out after a few hours.
Even fluid milk, which is far more susceptible to spoilage, can be left out for two hours, according to the USDA. String cheese is far more robust than fluid milk. String cheese is individually packaged in a clean environment, is a cultured food, and is low moisture. It can be safely left out of the refrigerator for hours. How long depends on the ambient temperature--obviously you want to protect it from high temperatures and direct sun. If taken to the beach, a small insulated lunch bag would be a good idea. But for just going to school, it would be fine in the backpack all day, so long as the backpack is not left lying on the blacktop in the summer sun for an hour.
Thawing fish properly can take anywhere from a few hours to overnight in the refrigerator.
As with any food, the length of time crawfish etouffee lasts in the refrigerator will depend on how it was handled after cooking and the temperature of the refrigerator. If you don't think you'll use it within a day or two, it might be best to freeze it.
Many food safety experts recommend that potentially hazardous foods, which would include goat cheese, should be left at room temperature for no more than 2 hours.
When marinating ribs....they should be left in refrigerator in marinade no longer than 48 hours as a rule.
I left a factory-sealed package of swiss cheese out of the refirgerator for almost 24 hours. I then put it in the refrigerator. Later that day I opened it. It felt a little greasy, smelled and tasted the same.
A hamburger typically takes about 1-2 hours to thaw at room temperature, or can be thawed in the refrigerator overnight.
No. You should not leave turkey unrefrigerated overnight. When you leave food at room temperature, bacteria grow more rapidly. It is safer to keep cooked food in the refrigerator to avoid food poisoning.