A few hours shouldn't be an issue. Just manually stir once and a while. I use my turkey baster while injecting bubbles. If it were the dead of winter I would be more concerned about heat. After several hours then we are talking real problems.
A portable generator would be a solid investment for days like today. $300. The wife and I are considering a 7 kw generator powered by natural gas. $5000... but that's only because we want to watch TV, lol.
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