All stars spend most of their lives on the main sequence is a result of it having enough hydrogen which is an important component and acts as the fuel for energy production used to ensure it remains in the main sequence.
Every star has a lot of hydrogen and which is a vital element every star has lots as it encourages the burning of hydrogen into helium which helps to put the stars in the main sequence during most of their lives.
The mass of the stars is also a determinant factor as the more mass a star the more amount of Hydrogen it uses and the less time it takes to remain in the main sequence.
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