I know that in certain countries like Japan or South Korea: it’s normal to leave the front door unlocked since the probaility of someone breaking in is low since their crime rate isn’t high. I knew a friend of mine who resides in Korea where they even left the car unlocked with the keys inside, can you do either of those things in America?
Two weeks is about how long I took when I made that trip, but I did some sightseeing on the way. Also even on the longest day I don’t think I drove for 10 hours in one day.