Just my 2 cents, but riding flat out on the slab all day is pretty boring.
It's safer, and more enjoyable, to take a nice stretch & rest stop when you stop for fuel.
Be sure to drink lots of water when you stop. Dehydration can literally kill you.
I'm good for 400+ miles, or a-l-l day long, whichever comes first.
Of course, I'll want a shower, hot meal and beer or 3 at the end of the day.