--- description: If Dorsey’s work week is anything like Musk’s, he’s going to need large doses of caffeine and a really good alarm clock title: Elon Musk Cautions Jack Dorsey Against Running Two Companies image: https://static.time.com/v3/assets/bltea6093859af6183b/blt4ed0a4ba07700d9d/69886048cd1bbabe166fcd4f/elon-musk-tesla.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  * [Business](/section/business/) ## Business Update your preferences in [Account Settings](/account/preferences/) Close * [Companies](/tag/companies/) ## Companies Update your preferences in [Account Settings](/account/preferences/) Close # Elon Musk Cautions Twitter CEO Jack Dorsey Against Running 2 Companies by [Jonathan Chew / Fortune](/author/fortune/) ## Jonathan Chew / Fortune Update your preferences in [Account Settings](/account/preferences/) Close Oct 7, 2015 4:01 PM CUT  Elon Musk at the Allen & Company Sun Valley Conference in Sun Valley, Idaho on July 7, 2015. Elon Musk at the Allen & Company Sun Valley Conference in Sun Valley, Idaho on July 7, 2015.Scott Olson—Getty Images by [Jonathan Chew / Fortune](/author/fortune/) ## Jonathan Chew / Fortune Update your preferences in [Account Settings](/account/preferences/) Close Oct 7, 2015 4:01 PM CUT Jack Dorsey [has returned](http://fortune.com/2015/10/05/dorsey-twitter-ceo/ "undefined") to Twitter as its permanent CEO, while still holding on to the same title at payment startup Square. And that has earned some cautious words from another famous multitasker: Elon Musk. As the dual-CEO of Tesla and SpaceX, Musk has inspired [countless](http://fortune.com/2015/01/21/elon-musk-micromanagement-control/ "undefined") [tales](http://www.entrepreneur.com/article/251020 "undefined") of how he manages to juggle all the responsibilities that running two major companies can bring. His advice to Dorsey? Don’t do it. “I wouldn’t recommend running two companies,” Musk said on stage at the Vanity Fair New Establishment Summit responding to a question on how he manages both roles. “It decreases your freedom a lot.” This, of course, coming from a man who [averages](http://www.businessinsider.com/elon-musk-sleeps-6-hours-a-day-2015-1 "undefined") six hours of sleep a day, [has clocked in](https://www.quora.com/How-did-Elon-Musk-work-for-100-hours-a-week-for-more-than-15-years "undefined") 100-hour working weeks for 15 years, averages one flight every two days [for work](http://www.businessinsider.com/how-elon-musk-schedules-a-typical-week-2015-5 "undefined"), and [still has time](http://observer.com/2013/09/elon-musk-is-dragging-his-family-on-a-cross-country-road-trip-to-tout-the-tesla-model-s/ "undefined") to take his five kids on a cross-country road trip. If Dorsey’s work week is anything like Musk’s, he’s going to need large doses of caffeine and a really good alarm clock. Musk shared more on how he segments his time at work. According to [_The Verge_](http://www.theverge.com/2015/10/6/9467685/elon-musk-jack-dorsey-ceos-two-companies "undefined"), Musk spends around 70% of his time on engineering and design issues, and 3% of his time on press and speaking engagements. The entrepreneur also shared [his thoughts](http://recode.net/2015/10/06/elon-musk-self-driving-cars-are-coming-sooner-than-you-think/ "undefined") on self-driving cars (they’re “two to three years away”), whether he was living inside a video game (“I don’t think I’m being played by somebody”), and whether he’d like to live forever. 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