I don't think the supr is being manipulative. If you feel your work is or will be finished early let him know beforehand so he has the option to give you something else to do. He may indeed prefer you stand around for an hour. That's his prerogative. You are making your own hours if you are showing up on unscheduled days because you left early. Not to be harsh but if I were him I would wonder why I needed a ft person at all. I would want someone who is both efficient and proactive. It could be the other employees have established that trust and communication.

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