Tesla Chief Executive Elon Musk said on Friday he thinks a recession will last until spring of 2024 after earlier raising concerns on demand in China and Europe.

“Just guessing, but probably until spring of ’24,” Musk said on Twitter when a user asked him how long the recession would last.

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Shares of Tesla slid on Thursday, a day after Musk said it was a “little harder” for the electric-vehicle maker to garner demand in the face of a weakening global economy.