The duration of power provided by a home generator can vary depending on several factors. Generally, generators can sustain power for a few hours to a few days. This depends on the generator’s fuel capacity, load capacity, and how efficiently it is used. Smaller generators may have a shorter runtime, while larger ones with higher fuel capacities can provide power for a longer duration. A professional can help you select a generator that meets your anticipated backup power needs and consider factors like load management to optimize runtime.