The United States Navy/military has an online tool available to the public (google Sunrise Sunset times and look for a govnerment/military site/address). I think the term is "civil twilight" and look for when it ends. This database will also give you an idea of trends--how the timings change as the seasons proceed, location by location.
You know how when the sunset is say.. 5:30, it takes a while longer before it becomes a lot darker? How long does it take? If the sunset is say, 5:15, would it only become pretty dark around 5:30-35?
Globally, year around? That seems very short. Anyhow.
da Answer wrote:
26 minutes is the average time between sunset and the end of civil twilight.