Quite some time. Basically until a large ball of rock hit a precise part of the moon wherein a small plaque with Nixon's name on it exists. Then considering the longevity of of SOME man made structures... I'd say you'd lose all visible trace of the human race in about 8-10,000 years.
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timeasmymeasure
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Date: 2006-01-11 09:56 am (UTC)Basically until a large ball of rock hit a precise part of the moon wherein a small plaque with Nixon's name on it exists.
Then considering the longevity of of SOME man made structures...
I'd say you'd lose all visible trace of the human race in about 8-10,000 years.