Elon Musk has told Twitter staff that they must commit to working “long hours at high intensity” or else leave the company, according to reports.
In an email to staff, the social media firm’s new owner said workers should agree to the pledge if they wanted to stay, the Washington Post reported.
Those who do not sign up by Thursday will be given three months’ severance pay, Mr Musk said.
The BBC has contacted Twitter for comment.
In his email to staff, also seen by The Guardian, Mr Musk said that Twitter “will need to be extremely hardcore” in order to succeed.