The maximum time it’s okay for wet canned cat food to sit out varies somewhat depending on the ingredients and preservatives used. While some wet cat food can be left out for up to 4 hours in cool temperatures, other types of wet cat food should only sit out for 1 to 2 hours. And if you feed your cat in a hot environment, even an hour may be too long. In any case, if your cat likes to pick at their food instead of eating it in one sitting, it’s recommended to put the uneaten remainder of their canned cat food in the fridge and bring it out again later rather than leave wet food out all day.