<Li> 9 to 5: Days in Porn, a 2008 documentary about the adult industry </Li> <Li> 9 to 5, a comic strip by Harley Schwadron </Li> <Li> From 9 To 5, a comic strip by Jo Fischer </Li> <Li> 9to5Mac, a popular news site that only publishes content related to Apple Inc . </Li>

Where did the phrase 9 to 5 come from