So you thought a hedge fund career was going to be easy? : Baby-faced hedge fund manager David Einhorn didn't say how many hours he worked last year in the investor letter he sent yesterday, but it seems fair to assume it was more than 40 a week. In 2018, "nothing went right" for Einhorn (his own words): " the losses were a mile wide and a yard deep," and his fund declined by 34.2%. None of this is conducive to an eight hour day. Einhorn is the new poster boy for the tribulations of working in hedge funds.