The World's Most Successful People Don't Actually Start Work at 4 a.m. The Most Successful Birds When you start working doesn't matter. When you stop working doesn't matter. What matters is what you accomplish during the hours you work -- and that means making an intentional decision about what time you get up and what time you start work. Don't get up at a certain time just because Tim Cook does. Don't start work at a certain time just because Sallie Krawcheck does. Figu