Common sense has to prevail. So as others have said, above 10,000’ with a healthy aircraft and no undue demand it’s not reasonable to do the paperwork. But the moment anything untoward crops up, that has to be the focus of your attention. I threw some Flight Ops. Inspectors off in Brussels some time ago. They were adamant that a fuel and time check had to be performed at every waypoint (with only a few minutes in the cruise at FL140) and other paperwork. I considered that one only was required for a 15-20 minute flight. It was clear they were idiots. Never heard a peep as a result. Don’t let inspectors put you off your stride.