condition mean min max 0 h after light 5.93905 5.83037 6.04773 4 h after light 6.829775 6.43246 7.22709 8 h after light 4.907875 4.86504 4.95071 4 h after dark 5.048955 4.82441 5.2735 8 h after dark 5.8492 5.79383 5.90457 12 h after dark 5.430235 5.38178 5.47869