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The skeleton code consumed the same amount of battery .5%/hour. There were only a few lines of code and the rtcwake call in the main loop. All the other calls execute only once at the start or not at all in this code. This would provide the lower bound of battery utilization, with the simplest of code. I guess 8 days is all we can get. I did check some of the tasks for potential stopping, but none of the likely candidates use much cpu.
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