condition mean min max 0 h after light 9.667455 9.5776 9.75731 4 h after light 6.018245 5.95456 6.08193 8 h after light 7.23966 6.60978 7.86954 4 h after dark 11.25939 9.92378 12.595 8 h after dark 10.118085 9.27287 10.9633 12 h after dark 10.116085 8.72207 11.5101