condition mean min max 4 h after light 1.8 1.8 1.8 8 h after light 4.0 2.5 5.5 12 h after light 10.5 3.0 18.0 4 h after dark 5.4 2.8 8.0 8 h after dark 16.450000000000003 10.3 22.6 12 h after dark 2.5999999999999996 2.4 2.8