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A member asked:
What happens if you are in a cave and avoid having contact with any kind of light in a long period of time?
A doctor has provided 1 answer
25 hours: Previous research has shown that persons living in caves shift to a 25 hour daily circadian rhythm instead of a 24 hour cycle. However, they were allowed contact with artificial light when they wanted it. I don't know the answer to your particular question, as such "research" would be considered torture. Perhaps some data can be gleaned from research involving those with blindness.
Answered 7/20/2012
5.8k views
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