BTDT a couple of years ago with my now 3.5 yo and won't be doing THAT again! Our trip was from Central CA to visit my mom in AZ, about a 10 hour drive normally but it took us 13. It was so hard keeping her happy, she wanted to get out and play, not be strapped into her seat all day long! She didn't want to lay down and sleep when we stopped for the night because she had been cooped up all day long. She had always hated her carseat anyway, this just made it worse. My youngest is a year old now, and I can't take her in the car for more than a half hour without her going balistic on me - she HATES the carseat! If you do go, leave in the early evening when baby is getting ready to go to sleep and drive through the night, that will be the easiest thing for all of you. Good Luck!