John Carmack probably hasn’t worked a full day in this century. In the 1990s he was one of the most productive people doing what he loved best. And luckily, af

John Carmack probably hasn’t worked a full day in this century. In the 1990s he was one of the most productive people doing what he loved best. And luckily, after only a few years, never had to have a “job”. For everyone else, there are marginal returns and higher productivity for shorter working hours — even the burger flipper is more productive in a 4 hour shift than an 8 hour shift.