Lactone tofu can be placed at room temperature for one night, but the following points should be noted:

1. storage environment: lactone tofu should be stored in a cool and ventilated place to avoid direct sunlight and high temperature. If the ambient temperature is too high, tofu may deteriorate.

2. Packaging integrity: ensure that the packaging of lactone tofu is intact, and prevent tofu from contacting with bacteria in the air, which will lead to corruption.

3. Storage time: If tofu needs to be placed for a long time, it is best to put it in a sealed container and eat it in a short time.

It should be noted that although lactone tofu can be left overnight at room temperature, it is best to eat it on the same day in order to ensure food safety and the best food quality.