condition mean min max 4 h after light 2.4 2.4 2.4 8 h after light 7.9 6.5 9.3 12 h after light 12.4 4.2 20.6 4 h after dark 12.25 7.0 17.5 8 h after dark 19.8 5.7 33.9 12 h after dark 26.450000000000003 9.7 43.2