It is generally safe to switch off your microwave oven right after using it. Microwave ovens are designed to handle rapid on/off cycles without any adverse effects. Waiting for the cooling fan to complete its cycle is not necessary, especially if you have only used the microwave for a short duration (e.g., 1 minute).
The purpose of the cooling fan is to dissipate heat generated during microwave operation and keep the internal components cool. After cooking, the oven may still be slightly warm, and the cooling fan helps to bring down the temperature to safe levels.
However, there are a few situations when it's a good idea to let the cooling fan complete its cycle or wait for a short while before opening the microwave door:
Extended Cooking Times: If you've used the microwave for an extended period, such as cooking food for several minutes, it's a good idea to wait for a minute or two to allow the cooling fan to do its job and reduce the internal temperature.
Convection or Combination Microwaves: Some microwave ovens have additional cooking modes, such as convection or combination modes, which generate more heat. In these cases, waiting for a short period can help ensure the oven's internal components cool down adequately.
Overheating Sensation: If the microwave feels excessively hot or emits a burning smell during or after cooking, it's best to let it run for a bit longer to ensure any excess heat dissipates.
In general, microwave ovens are equipped with safety features that prevent them from running if they get too hot, but allowing a brief cooldown period can help extend the overall lifespan of your appliance and prevent any potential issues in the long run. If you have concerns about your specific microwave model, it's best to consult the manufacturer's guidelines or the user manual for recommended usage and cooldown procedures.