on the remaining you wouldn’t mind a coffee break to stretch your legs once in a while. Yes that even applies to travelling salesmen and the like: Go stretch your legs and run some numbers while you charge (but the X days out of Y will look different).
Forget “wouldn’t mind”, you (one) absolutely owe it to other road users to take those breaks. It just isn’t safe to drive continuesly for hours and hours without them. You aren’t magically the exception, you are a human being like everyone else and you are not a safe driver after hours of unbroken driving. Without exception (and that does include professional drivers who sadly are contractually required to do so.)