There is no way a person in his position has any time for focus. CEOs of big companies (especially in case they manage multiple companies!) usually act as firefighters and mainly mentors to top-management. They need to be able to quickly jump between calls, board meetings, press, Q&A, in matter of minutes.
Something very similar is also written in Cal Newport's Deep Work book, where Jack Dorsey's typical day is outlined just as a series of interruptions.
I guess that tweeting between these interactions is not that time-consuming for him, + he actually sleeps at the workplace and is 100% focused on work.
Cocaine addict may be behind long hours for medical doctors: "Fledgling residents had to suffer long, consecutive work shifts, day and night. To Halsted, sleep was a dispensable luxury that detracted from the ability to work and learn. Halsted’s mentality was difficult to argue with, since he himself practiced what he preached, being renowned for a seemingly superhuman ability to stay awake for apparently days on end without any fatigue.
Only after Halsted’s death did a secret come to light that explained
the maniacal structure of his residency program and his ability to forgo sleep. Halsted was a cocaine addict" https://medicaljustice.com/a-century-of-brutal-call-schedule...
Nah, he is just yet another incompetent person who became rich mostly due this parents. He cultivated an image in f being a genius and it worked for a long while, but with Twitter he showed his true capabilities because he had no one who did the actual work.
There’s an interesting dive into his educational and work background floating around Twitter right now; it sounds like he lied about his college degree and was working in the U.S. illegally for a while as a young adult.
Something very similar is also written in Cal Newport's Deep Work book, where Jack Dorsey's typical day is outlined just as a series of interruptions.
I guess that tweeting between these interactions is not that time-consuming for him, + he actually sleeps at the workplace and is 100% focused on work.