condition mean min max 0 h after light 8.50353 8.28512 8.72194 4 h after light 5.143815 4.70737 5.58026 8 h after light 2.600315 2.14417 3.05646 4 h after dark 3.595355 2.34457 4.84614 8 h after dark 3.684235 2.76604 4.60243 12 h after dark 6.7922 6.45091 7.13349