condition mean min max 0 h after light 5.16524 5.02935 5.30113 4 h after light 7.980815 7.56204 8.39959 8 h after light 6.58966 4.54536 8.63396 4 h after dark 5.21804 4.5122 5.92388 8 h after dark 6.61667 6.38116 6.85218 12 h after dark 4.57635 4.43434 4.71836