The northern most peninsula of Iceland is Rifstangi at 66°32,3´N. The southern most peninsula is Dyrholaey at 63°23,6´N. The western most peninsula is Bjargartangi at 24°32,1´V and the eastern most peninsula is Gerpir at 13°29,6´V. So the mainland of Iceland lies between those parallels of latitude.

Basically this means that there is a huge difference from sunrise to sunset between the longest and shortest days of the year in Iceland.

Around December 22 the days are very short, around 4 hours from sunrise to sunset, and if it is cloudy there can be hardly any daylight.  Around  June 20 on the other hand this turns totally around. Sunrise is around 03:00 and the sunset is not until midnight and it never gets dark, about 21 hours from sunrise to sunset.

The interesting and important thing for photographers is though, that in Iceland the magic twilight extends into hours through the year when weather conditions allow.