That depends on your location, and the weather. Even though it is only 4:40 PM in Sacramento, CA right now, it's pretty dark - because the sky is overcast.
In rural areas, the Sun can rise or set an hour earlier for you than for your neighbor, if you are in different time zones.
So, location is important.
You can visit the web site of the U.S. Naval Observatory, and calculate the time of sunset or sunrise for any location in the world, at the link below.
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The "official" time of twilight is 18 minutes; that's the recognized period between "dark" and sunrise, or between sunset and dark.
In reality, that varies by location, terrain and weather, and in the eyesight of the observer.
It depends on your location and time of year. You can check the sunset time for your specific location on a weather website or app to determine when it will get dark tonight.
Light travels at 186,000 miles per second, and the Sun is about 93,000,000 miles away. So it takes about 500 seconds for light to reach the Earth.
That depends on your latitude, and also on the season. When the Sun is somewhere between 12 and 18 degrees below the horizon, it gets quite dark.
15 to 20 minutes after sunset. The local time depends on
where on Earth you live, and it changes every day.
It is generally about 18 minutes between sunset and the end of evening twilight.
Saturn will be visible in the southwest sky from Lima, Ohio after sunset. The best time to see Saturn tonight would be a few hours after sunset when the sky is dark enough for the planet to be easily visible.
Tonight at 7:00 pm.
That's general and relative so open to interpretation of listener. Most would agree simply means after dark, used when specific time not practical or necessary or to avoid a timed appointment
The cowboy game tonight is at 7:20 PM Central Time. The game will be broadcast on NBC.
Dallas on TNT airs at 9:00 PM Eastern Time.