condition mean min max 0 h after light 5.238185 5.20215 5.27422 4 h after light 16.0946 15.2017 16.9875 8 h after light 30.18805 30.1778 30.1983 4 h after dark 14.6408 10.7531 18.5285 8 h after dark 6.69192 6.03814 7.3457 12 h after dark 6.478125 4.50665 8.4496