Double-shifting? I get 10-12 hours all the time...I know, not what you meant, but still.
Agreed. But UPS doesn't care. They will fire you if you walk out because in your mind, you've worked enough hours for that particular day. I've seen it happen.
What I was hoping for was some kind of basis for what you were saying, either contractual, or from the national grievance panel, so that I and my fellow co-workers could be better informed for the future. "I'm only part-time" won't get you your job back, in my building, if you're fired for walking out at 5.01 hours. "I'm sorry, and it won't happen again" will. Period.