I always jokingly said about the place where I worked, that there were two things they’d fire you for, espionage and timecard fraud, and I wasn’t entirely certain about espionage.
I knew a couple guys who were dancing on the edge but once they were warned, they straightened up.
Of course, I would walk across an empty parking lot into the building for a day shift and 8 hours later walk back out across an empty parking lot. The day workers had managed to fill up the parking lot and put in an 8.5 hour day in the meantime. Go figure.
And we won’t even mention how long a lunch “hour” really was.