A good while back we were out for about 8 hours. A friend five miles away was out for a week. It all depends on where the breakers tripped. He was closer to the big yard on Kipling.4 hours if I remember correctly. I had a portable 2kw generator at the time, I wasn’t out long enough to setup. In fact, I’ve never needed to run on a genie at home in 40 years.