Elon musk (Founder and CEO of Space X, Tesla Inc. , Neuralink) manages his time by using a method called timeboxing. In time management, timeboxing allocates a fixed time period, called a time box, to each planned activity. Timeboxing is used by several project management apporoaches and it is also used by individuals to address personal tasks in a smaller time frame.

Here is a detailed video by college info geek about Timeboxing and how Elon Musk manages his time: