Microwave ovens are not typically limited to running for only 8 hours. They are designed to handle extended periods of operation without any specific time limit. However, it is important to note that using any electrical appliance continuously for an extended period can lead to overheating and potentially cause safety issues.
To prevent overheating and ensure safe operation, microwave ovens are equipped with thermal protection mechanisms. These mechanisms include temperature sensors and thermal fuses that monitor the internal temperature of the oven. If the temperature rises beyond a certain threshold, these safety features can automatically shut off the microwave to prevent damage or a fire hazard.
It's worth mentioning that microwaves are primarily designed for intermittent use, where they are operated for shorter periods of time to heat or cook food. If you have a specific need for running a microwave continuously for an extended duration, it is recommended to refer to the user manual provided by the manufacturer. The manual should provide guidelines on usage limitations and safety recommendations to follow for prolonged operation.