condition mean min max 0 h after light 17.185 14.3834 19.9866 2 h after light 8.25952 7.73059 8.78845 4 h after light 6.13886 5.79961 6.47811 8 h after light 8.594215 7.6905 9.49793 12 h after light 13.81385 12.1408 15.4869 2 h after dark 13.80795 12.9176 14.6983 4 h after dark 14.4549 13.138 15.7718 8 h after dark 20.1055 19.907 20.304 12 h after dark 19.7971 18.0213 21.5729