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Business Insider interviewed PWC Partner Lawrence Ballard about a typical day for him. It sounds positively exhausting, starting waking up at 4:30 a.m. so he can get to the office by 7:30 a.m. The day itself is packed with meetings and calls until he finally leaves the office at 7 p.m. to get home as late at 9:30 to then check more emails until 10 and, finally, getting to sleep at 11. Then he wakes up and does it all over again. It would appear that, among the many thing needed to make partner at a Big Four firm, a willingness to get only about six hours of sleep a night is one of them.