Jack Dorsey explains why wanting to work 20 hours a day to be like Elon Musk is 'bulls---' (SQ, TWTR)

· Jack Dorsey is warning startup founders that they need to be concerned about burning themselves out. 
· Dorsey discussed burnout on a recent episode of "The Boardroom: Out of Office," a podcast hosted by Rich Kleiman, NBA superstar Kevin Durant's manager. 
· Dorsey warned that founders shouldn't try to emulate famous...