The length of time that an incubator can stay without electricity will depend on a variety of factors, including the type of incubator, the stage of development of the eggs being incubated, and the ambient temperature. In general, incubators that are designed for incubating chicken eggs can usually stay without electricity for a few hours without harming the eggs, as long as the ambient temperature is not too hot or cold. However, if the incubator is without electricity for an extended period of time, the eggs may start to lose moisture and the embryos may begin to dry out, which can lead to abnormal or unsuccessful hatching. If the eggs being incubated are at a more advanced stage of development, they may be more sensitive to changes in temperature and humidity and may be more likely to be affected by a power outage. In this case, it may be necessary to try to restore power to the incubator as soon as possible in order to maintain the optimal environment for the eggs. It's important to note that if the incubator is without electricity for an extended period of time, it may be necessary to discard the eggs and start again with fresh eggs. This is because the eggs may have been exposed to conditions that are not suitable for their development, which can result in abnormal or unsuccessful hatching.