condition mean min max 4 h after light 4.1 4.1 4.1 8 h after light 5.7 3.9 7.5 12 h after light 8.850000000000001 6.4 11.3 4 h after dark 8.45 7.7 9.2 8 h after dark 9.4 7.2 11.6 12 h after dark 7.449999999999999 5.8 9.1