condition mean min max 0 h after light 8.875505 8.63092 9.12009 4 h after light 8.690835 7.98505 9.39662 8 h after light 15.97955 14.3876 17.5715 4 h after dark 15.381499999999999 12.5904 18.1726 8 h after dark 12.3911 11.5076 13.2746 12 h after dark 9.452035 8.85547 10.0486