When it's time to clock out from work, what time do you leave?

When its time to clock out from work, what time do you leave?
I'm out the door a few minutes early. I count the time it takes to walk to the parking garage as time served because I'm technically "still at work."
Right on the dot. I'm not talking to anyone, not doing a second more of work, I'm gone.
I typically leave a few minutes after my official end time.
I never seem to be able to leave when it's time. This person needs this or that, boss comes to talk to me, I'm trying to finish that one last thing...20, 40, an hour after clock out time is my normal.
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When it's time to clock out from work, what time do you leave?
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