jtr1962
Storage? I am Storage!
I think the 42-hour day you mentioned comes from experiments where subjects were put into caves for long periods. In the absence of visual cues for time of day subjects at first shift to a 25-hour day, starting each new day about one hour later (by normal standards) than the day before. After a few weeks there is another lengthening of the "day" to ~42 hours. Interestingly, subjects will be asleep and awake in the same ratio as they were when on a normal 24-hour day. Someone who normally sleeps 7 hours would sleep 12. The times between meals would be equally prolonged. While the 25-hour day may have a basis in evolution (days were longer when the more primitive parts of our physiology were evolving) I don't know where the 42-hour day comes from.