It's the longest day outside the tropics from what I wikied. And the poles too I think.
the tropics have relatively consistent day lengths. day lengths vary the more north/south of the equator you are. and the disparity increases more rapidly the further away you get.
ex: houston is approximately 29 degrees north. today, here, sunrise to sundown is 14 hours and 2 minutes. chicago is approximately 42 degrees north, and its day is 15 hours and 13 minutes. edmonton is about 53 degrees north, and its day is 16 hours and 59 minutes. anchorage is 61 degrees north, and today is 19 hours and 22 minutes.
so, the first 13 degrees there only added about an hour and 10 minutes. the next 11 degrees added an hour and 45 minutes, and then another 8 degrees added more than 2 hours and 20 minutes.
going the other way, melbourne is about 37 degrees south and its day is 10 h and 31 minutes.