condition mean min max 4 h after light 4.96565 3.78764 6.14366 8 h after light 10.63014 9.89718 11.3631 12 h after light 16.03565 15.0866 16.9847 4 h after dark 14.012933333333333 13.7922 14.446 8 h after dark 12.171266666666666 11.9469 12.3249 12 h after dark 6.6664200000000005 6.03781 7.09914