Time of DayHoursLight LevelVisibility
Dawn04:00 – 06:00DimPoor
Day06:00 – 18:00BrightGood
Dusk18:00 – 20:00DimPoor
Night20:00 – 04:00Total DarknessBad

Use the band the party is in when a Stage begins, for both travel time and the Detection DC. See Visibility Table.