How long could an ecosystem survive without sunlight?

I am designing a terraformed Venus, where the planet has been given an Earth-like atmosphere but keeps it's original rotation rate. Colonists are importing Earth life to Venus to add a biosphere to the planet. My question is whether or not Earth life could survive the long day-night cycle of Venus? Research done into the atmosphere of a terraformed Venus says that the atmospheric circulation will be enough to keep the night side of the planet close to the temperature of the day side, so temperature is not a problem. If this Earth life can't survive a 100 day long night, what is the maximum period of time it could?

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How long could an ecosystem survive without sunlight?

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