21:43
@DeletedUser Bit more than that, even... (1) A lot of big trees (like literally the biggest trees in the world) growing for hundreds of years here. (2) Most of California has experienced severe drought for quite a few years, (3) (your first), a very rainy 2016/2017 rain season (enough to officially end drought in many areas), (4) summer 2017 had multiple major heat waves, (5) and then again 2018 had major heat waves.
Oh, also a bunch of stuff with pine beetles, sudden oak death, etc...
So, many many tons of dead trees.
Then rain and sun really help get you lots of undergrowth in the forested areas and grass in grassy areas, but heat waves dry a lot of it out.
Oh, there's also some areas that get a summer (and fall) wind pattern of hot dry winds some years. With convoluted terrain that can make that worse.
And, yeah, California is also a really big state with a really big population. There's both big populated urban and suburban areas (multiple big metro areas around LA and SF), and big wild areas, with stuff where there's areas that people live right next to the wild stuff, even right in it, or smaller communities in the middle of otherwise wild areas.