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It consumes 2.2 units of wood every day, so 20 wood is enough for 9 days and 2 hours.
When in snow or rain, it will consume 1 additional wood for every 27.78 seconds spent in rain.
It is generally not resource and work-time efficient to use once Electricity has been researched, however its grid independence and immunity to power outages and solar flares make it very useful in niche applications even beyond this point.