If you accidentally put food in the freezer without freezing it first, the food will still freeze, but it may take longer than if it were already pre-frozen. The freezing time will depend on factors such as the type and quantity of the food, as well as the temperature of the freezer. Generally, food placed in the freezer will begin to freeze within a few hours.
However, if the food is not pre-frozen, the freezing process may be slower, and this delay can potentially affect the quality and safety of the food. The slower freezing process can lead to the formation of larger ice crystals, which can damage the texture and structure of the food, potentially resulting in a loss of quality. It can also increase the risk of bacterial growth and spoilage.
To maintain the best quality and safety of the food, it is recommended to properly pre-freeze it before placing it in the freezer. This involves chilling the food in a refrigerator until it reaches a low temperature (usually around 40°F or 4°C) and then transferring it to the freezer for long-term storage.