First of Ramadan this year coincided with March 1, and it was a 12:45 hours of fasting from the first light of dawn to sunset at my location, also near Los Angeles. Today it's going to be 13:15 hours long, and by the time last of Ramadan rolls in around the end of March, it will be 13:37 hours.
Ramadan is observed following the lunar calendar, which is shorter than solar- based calendars by about 10 days. A winter Ramadan is short and easy in the northern hemisphere and we will have the shortest days in 2031. 2047 it's going to be middle of summer, so the hardest.
In case you ask, well what about places where sun does not set? When do you have your Suhoor (meal before dawn) and iftar (breakfast meal at sunset)? Opinions differ, but people usually follow the more realistic time of sunrise and sunset at a reference location. My brother in law was in Sweden few years back and he used the time of Mecca as reference.