Heh. I've been employed for more than 30 years.
My employers get the hours they pay for. They get me, fully, for those hours. I don't screw around, and I produce excellent work, consistently. So they get what they pay for.
(Note: I'm happy to stay as late as necessary, once in a while, when the project actually warrants it. But if the expectation is "free work", they can fuck right off.)