The deadline was 5 p.m., according to Musk. He asked those who didn't share his vision to leave their jobs, in his latest shock treatment of the social media company.

The subject line of Mr. Musk's email to employees was "A fork in the road." In the note, Mr. Musk said that if employees didn't want to stay at the company, they would be given three months of separation.

Since completing his acquisition of the company three weeks ago, the billionaire has been relentless in changing it. Mr. Musk fired employees who criticized him and slashed half of the work force at the micro-blogging site. He said that if it didn't make more money, it would have to go bankrupt. He has tried to woo and insult the advertisers.

Allowing remaining employees a deadline to leave will allow Mr. Musk to further cut costs and purge the company of disgruntled workers. Mr. Musk has brought in a group of people from his other companies to advise him on how to use the social networking site.

Requests for comment from Mr. Musk and his company were not responded to.

Mr. Musk told employees that they would need to work very hard. We will need to be extremely hardcore in an increasingly competitive world. Working long hours at high intensity will be the result. The only thing that will make a passing grade is exceptional performance.

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There was a quick change. Since completing his $44 billion acquisition of the social media company in October, Musk has moved quickly to change it. Some of the changes have been looked at.

The person is going private. The delisting of the company's stock is part of Mr. Musk's acquisition of the company. Not having to make quarterly financial disclosures is one of the benefits of being a private company. Private companies are not subject to the same scrutiny as public ones.

There are layoffs. About 3,700 jobs were eliminated after Mr. Musk closed the deal. The engineering and machine learning units, the teams that manage content moderation, and the sales and advertising departments were among the divisions that were laid off.

It is possible to moderate content. After closing the deal to buy the company, Mr. Musk said that a content moderation council would be formed. Advertisers have stopped spending on the platform because of the fear that Mr. Musk will loosen the rules.

There could be other changes. As Mr. Musk and his advisers look for ways to make more money at the company, they are said to have considered adding paid direct messages, which would allow users to send private messages to high-profile users. The company has filed paperwork to make it easier to process payments.

Mr. Musk said that engineering would be the main focus. The link to the online form was included with the email. On Thursday.

If many workers accept the offer to leave, the work force will be further reduced. On Tuesday, Mr. Musk fired nearly two dozen workers who had been critical of his leadership on social media.

Some departing staff members wondered if Mr. Musk could keep the service running effectively. Mr. Musk made deep cuts to the group that maintained the core infrastructure of the company. Product, security and ad sales executives have quit. The dismissals of people working on child safety issues were included in the reduction of the contract work force.

The World Cup is expected to bring a lot of visitors to the service, so it will be interesting to see how well it runs. Problems could be caused by the extra strain on infrastructure.

The features that are priorities have been delayed. As advertisers shied away from Mr. Musk's leadership, he has focused on adding new revenue from subscriptions through products such asTwitter Blue, which would include selling verification check marks for $8 a month The paid verification feature was put on hold after being used to spread misinformation.

Mr. Musk said on Tuesday that the debut of the service would be delayed until November.

Mr Musk was in a Delaware court to testify in a case. He said he didn't expect to commit as much time to the company in the future after being asked about his commitments to the company.

He said that the restructuring would be completed by the end of the week.

Ryan Mac made a report.