Huge difference between driving 24 hours straight and with a 4 or 6 hour nap. Not even comparable.
the OP did SAY....straight thru OR maybe a 4 hr or so break...to which I responded to the latter...
AND further I've done loads for present carrier where the only break time was the difference between the 50mph calculation and the real drive time....which over 1500 mies is approx 4-5 hrs....so you could say that is straight thru....