Tonight, the sun set at 9.10 pm here in Seattle. It will rise at 5.11 am.
I see our pitch black night length here at the summer solstice point is only 1 hr 43 mins, if one takes out all the kinds of twilight.
[Graph from timeanddate.com] I added the Sun of May from the Uruguay national flag to brighten the graph up. (Go Uruguay! They notched up World Cup victories against Egypt and Saudi Arabia & will play Russia on Monday). The graph below explains the different kinds of twilight. Solar noon is when the sun reaches its highest point in the sky. [Graphic and explanation from timeanddate.com] Astronomical Twilight, Dawn, and Dusk. Astronomical twilight occurs when the Sun is between 12 degrees and 18 degrees below the horizon. Astronomical dawn is the time when the geometric center of the Sun is at 18 degrees below the horizon. Before this time, the sky is absolutely dark.