The distance from Kansas to LA is 1,413 miles.
If you drove from Kansas to LA it would take you around 3 to 4 days depending on how many miles you drive in a day.
I once drove from Kansas to LA and drove the first day 800 miles and then found a motel to sleep in and rest up.
Then the next day I only drove 500 miles before I got tired and found another motel to sleep again and then the next day finished up the trip and made it to LA where I made it to a friends house.
So driving from Kansas to LA took me 3 days to make it from Kansas to LA.
You can fly there in one day but I hate flying and loved the road trip so I took a road trip from Kansas to LA in my car and actually enjoyed the road trip although it can be very tiring.