It generally gets truly dark about 70 to 100 minutes after sunset. This period is known as twilight, which has three stages: civil twilight (still light enough to see), nautical twilight (stars become visible and objects appear as silhouettes), and astronomical twilight (true darkness for viewing space objects). So, it takes roughly an hour to an hour and a half after the sun sets for it to be fully dark outside.
The exact time it gets dark depends on the location, date, and season due to Earth's tilt and orbit around the sun. For example, near the equator days and nights are almost equal, but in higher latitudes, the length of daylight and the onset of darkness vary significantly across seasons.
Would further details be needed for a specific location or date?
