LOL!!! I know exactly why. Because the 'Texas heat' went on for two and a half days (it seemed). Arizona was hot too, but it didn't take us days to get through it. ;-)
I don't know how many times my brother and I asked my mom, "what state are we in now?" The answer was always "the same state we were in the last five times you asked....TEXAS!". LOL.
LOL! Okay, I understand now! Yes, it does take quite a lot of hours to drive all the way across Texas (unless you're just driving across the *panhandle*! That would be like driving across many of the other states, and you could do several in a day - a piece of cake!)
We're so used to wide open spaces where you can see for miles and miles, and driving for several hours to see the mountains or get to a lake large enough to put a speedboat on. :)