what does the expression banker s hours mean 
banker s hours as an expression means a shorter work day than what most businesses have which was once 9 a m to 5 p m by comparison bankers were said to work between 10 a m and 3 p m the hours that banks used to be open the bottom linethe 3 6 3 rule is an outdated slang term from the 1950s through the 1970s that referred to the perception that banking at the time consisted of paying account holders 3 charging 6 when lending money and calling it a day and leaving by 3 p m when banks used to close the term became less relevant after regulations changed in the 1970s and banks became more competitive with each other and offered a greater variety of rates 