Zurich/London/New York — Elon Musk sees no option but to keep working at his current relentless pace, no matter the deepening concerns of board members and investors about his health and stability as he propels Tesla toward a possible rebirth as a private company. Only a few hours before sunrise in California on Sunday, Musk said he had just gotten home from the electric-car factory where he has toiled — and often slept — for months to ramp up Model 3 sedan production. The CEO rebutted a post from digital-media mogul Arianna Huffington, who had urged him to take time off lest he fall short of his ambitions to change the world. Sorry, Musk wrote around 2.30am: "It is not" an option: "Ford & Tesla are the only 2 American car companies to avoid bankruptcy. I just got home from the factory. You think this is an option. It is not." The exchange underscores Musk’s determination to lead Tesla through the turmoil that accelerated after his August 7 tweet suggesting he had secured funding to...

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