On my end up here in the northern states it can get cold, so a half day long power outage would be uncomfortable for the reptiles and it would take a couple days to have serious problems. However, depending on where I find myself living there are... issues with design for our power grid. Notably only the wealthier parts of the Pittsburgh suburban area have underground power, meaning most areas keep their power on the sidewalk popsickle sticks. There are a lot of higher elevations locally, meaning the power gets cut out during wind storms often.
Usually the problem is resolved in ten minutes to a couple hours, those are what the battery backup is meant for.
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