“Nine to five” is slang for work, as most jobs have working hours between 9 AM and 5 PM. In 8 Mile, Jimmy has a very hard time keeping his job at the factory, always arriving late/boss keeps pushing him to be better. Plus his job isn’t enough for him to pay bills, raise his sister and realize his dream of moving out of the trailer park.
In the real life parallel, Eminem had the same problems: a dead-end job, an infant daughter to raise, a shitty mom and shitty baby-momma.
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