Forget that. Take your time. Be comfortable. You've got a few more hours to go, enjoy yourself. Stretch, have your snack outside of the car so it doesn't get as messy and you're not hungry in a little bit (and as the driver, so you're not distracted trying to eat while driving). Don't get me wrong, don't just be idle at the stop, do what you need to do and get moving again. But you don't need to rush. Its not going to make that big of a difference in the end.