Eminem - 'Rap God.' Written in: 6 Minutes, 1 Second.
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11 Songs That You Won't Believe Were Written In Less Than A Day

5. Eminem - 'Rap God.' Written in: 6 Minutes, 1 Second.
In a Q&A on his Facebook page the Rap God told fans that his 2013 hit was written in "six minutes and one second." The song itself is six minutes and seven seconds long, with the last word uttered at 6.01. So either Em wrote the entire thing in one go with no pauses or hesitations, or he's exaggerating slightly.