condition mean min max 4 h after light 2.4 2.4 2.4 8 h after light 6.4 3.5 9.3 12 h after light 3.1999999999999997 1.8 4.6 4 h after dark 5.85 5.8 5.9 8 h after dark 2.75 2.7 2.8 12 h after dark 8.35 4.0 12.7