condition mean min max 4 h after light 3.0 3.0 3.0 8 h after light 2.0 1.8 2.2 12 h after light 1.9000000000000001 1.1 2.7 4 h after dark 1.7 1.1 2.3 8 h after dark 8.6 1.8 15.4 12 h after dark 4.4 1.6 7.2