The comparison was between rats who could eat anytime and rats eating within a 10 hour window. What makes 10 hours the magic? Could it be 11, 12, 14 hours? Is i

The comparison was between rats who could eat anytime and rats eating within a 10 hour window. What makes 10 hours the magic? Could it be 11, 12, 14 hours? Is it better if the window is 6 or 8 hours? Would it be different on a day in which the sun shone for 16 hours or 12 his? There is clearly something there but 10 hours seems arbitrary.