condition mean min max 0 h after light 7.520865 7.43554 7.60619 4 h after light 4.63101 3.89414 5.36788 8 h after light 9.954235 8.16077 11.7477 4 h after dark 7.207695 5.35027 9.06512 8 h after dark 8.113335 5.95777 10.2689 12 h after dark 3.133985 3.00151 3.26646