condition mean min max 0 h after light 7.729505 7.3526 8.10641 4 h after light 12.71735 11.6231 13.8116 8 h after light 10.503135 9.99327 11.013 4 h after dark 10.066385 9.31897 10.8138 8 h after dark 9.061465 8.53595 9.58698 12 h after dark 8.98688 7.21966 10.7541